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\frac{\frac{a+1}{\left(a+1\right)\left(a+h+1\right)}-\frac{a+h+1}{\left(a+1\right)\left(a+h+1\right)}}{h}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of a+h+1 and a+1 is \left(a+1\right)\left(a+h+1\right). Multiply \frac{1}{a+h+1} times \frac{a+1}{a+1}. Multiply \frac{1}{a+1} times \frac{a+h+1}{a+h+1}.
\frac{\frac{a+1-\left(a+h+1\right)}{\left(a+1\right)\left(a+h+1\right)}}{h}
Since \frac{a+1}{\left(a+1\right)\left(a+h+1\right)} and \frac{a+h+1}{\left(a+1\right)\left(a+h+1\right)} have the same denominator, subtract them by subtracting their numerators.
\frac{\frac{a+1-a-h-1}{\left(a+1\right)\left(a+h+1\right)}}{h}
Do the multiplications in a+1-\left(a+h+1\right).
\frac{\frac{-h}{\left(a+1\right)\left(a+h+1\right)}}{h}
Combine like terms in a+1-a-h-1.
\frac{-h}{\left(a+1\right)\left(a+h+1\right)h}
Express \frac{\frac{-h}{\left(a+1\right)\left(a+h+1\right)}}{h} as a single fraction.
\frac{-1}{\left(a+1\right)\left(a+h+1\right)}
Cancel out h in both numerator and denominator.
\frac{-1}{a^{2}+ah+a+a+h+1}
Apply the distributive property by multiplying each term of a+1 by each term of a+h+1.
\frac{-1}{a^{2}+ah+2a+h+1}
Combine a and a to get 2a.
\frac{\frac{a+1}{\left(a+1\right)\left(a+h+1\right)}-\frac{a+h+1}{\left(a+1\right)\left(a+h+1\right)}}{h}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of a+h+1 and a+1 is \left(a+1\right)\left(a+h+1\right). Multiply \frac{1}{a+h+1} times \frac{a+1}{a+1}. Multiply \frac{1}{a+1} times \frac{a+h+1}{a+h+1}.
\frac{\frac{a+1-\left(a+h+1\right)}{\left(a+1\right)\left(a+h+1\right)}}{h}
Since \frac{a+1}{\left(a+1\right)\left(a+h+1\right)} and \frac{a+h+1}{\left(a+1\right)\left(a+h+1\right)} have the same denominator, subtract them by subtracting their numerators.
\frac{\frac{a+1-a-h-1}{\left(a+1\right)\left(a+h+1\right)}}{h}
Do the multiplications in a+1-\left(a+h+1\right).
\frac{\frac{-h}{\left(a+1\right)\left(a+h+1\right)}}{h}
Combine like terms in a+1-a-h-1.
\frac{-h}{\left(a+1\right)\left(a+h+1\right)h}
Express \frac{\frac{-h}{\left(a+1\right)\left(a+h+1\right)}}{h} as a single fraction.
\frac{-1}{\left(a+1\right)\left(a+h+1\right)}
Cancel out h in both numerator and denominator.
\frac{-1}{a^{2}+ah+a+a+h+1}
Apply the distributive property by multiplying each term of a+1 by each term of a+h+1.
\frac{-1}{a^{2}+ah+2a+h+1}
Combine a and a to get 2a.