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20x+25-10\left(x+1\right)=15-12
Multiply both sides of the equation by 20, the least common multiple of 4,2,5.
20x+25-10x-10=15-12
Use the distributive property to multiply -10 by x+1.
10x+25-10=15-12
Combine 20x and -10x to get 10x.
10x+15=15-12
Subtract 10 from 25 to get 15.
10x+15=3
Subtract 12 from 15 to get 3.
10x=3-15
Subtract 15 from both sides.
10x=-12
Subtract 15 from 3 to get -12.
x=\frac{-12}{10}
Divide both sides by 10.
x=-\frac{6}{5}
Reduce the fraction \frac{-12}{10} to lowest terms by extracting and canceling out 2.