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\frac{\frac{a\left(a-b\right)}{a^{2}}}{\frac{a}{b}-\frac{b}{a}}
Factor the expressions that are not already factored in \frac{a^{2}-ab}{a^{2}}.
\frac{\frac{a-b}{a}}{\frac{a}{b}-\frac{b}{a}}
Cancel out a in both numerator and denominator.
\frac{\frac{a-b}{a}}{\frac{aa}{ab}-\frac{bb}{ab}}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of b and a is ab. Multiply \frac{a}{b} times \frac{a}{a}. Multiply \frac{b}{a} times \frac{b}{b}.
\frac{\frac{a-b}{a}}{\frac{aa-bb}{ab}}
Since \frac{aa}{ab} and \frac{bb}{ab} have the same denominator, subtract them by subtracting their numerators.
\frac{\frac{a-b}{a}}{\frac{a^{2}-b^{2}}{ab}}
Do the multiplications in aa-bb.
\frac{\left(a-b\right)ab}{a\left(a^{2}-b^{2}\right)}
Divide \frac{a-b}{a} by \frac{a^{2}-b^{2}}{ab} by multiplying \frac{a-b}{a} by the reciprocal of \frac{a^{2}-b^{2}}{ab}.
\frac{b\left(a-b\right)}{a^{2}-b^{2}}
Cancel out a in both numerator and denominator.
\frac{b\left(a-b\right)}{\left(a+b\right)\left(a-b\right)}
Factor the expressions that are not already factored.
\frac{b}{a+b}
Cancel out a-b in both numerator and denominator.
\frac{\frac{a\left(a-b\right)}{a^{2}}}{\frac{a}{b}-\frac{b}{a}}
Factor the expressions that are not already factored in \frac{a^{2}-ab}{a^{2}}.
\frac{\frac{a-b}{a}}{\frac{a}{b}-\frac{b}{a}}
Cancel out a in both numerator and denominator.
\frac{\frac{a-b}{a}}{\frac{aa}{ab}-\frac{bb}{ab}}
To add or subtract expressions, expand them to make their denominators the same. Least common multiple of b and a is ab. Multiply \frac{a}{b} times \frac{a}{a}. Multiply \frac{b}{a} times \frac{b}{b}.
\frac{\frac{a-b}{a}}{\frac{aa-bb}{ab}}
Since \frac{aa}{ab} and \frac{bb}{ab} have the same denominator, subtract them by subtracting their numerators.
\frac{\frac{a-b}{a}}{\frac{a^{2}-b^{2}}{ab}}
Do the multiplications in aa-bb.
\frac{\left(a-b\right)ab}{a\left(a^{2}-b^{2}\right)}
Divide \frac{a-b}{a} by \frac{a^{2}-b^{2}}{ab} by multiplying \frac{a-b}{a} by the reciprocal of \frac{a^{2}-b^{2}}{ab}.
\frac{b\left(a-b\right)}{a^{2}-b^{2}}
Cancel out a in both numerator and denominator.
\frac{b\left(a-b\right)}{\left(a+b\right)\left(a-b\right)}
Factor the expressions that are not already factored.
\frac{b}{a+b}
Cancel out a-b in both numerator and denominator.