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30x+25-12\left(5+5\right)=40
Multiply both sides of the equation by 60, the least common multiple of 2,12,5,3.
30x+25-12\times 10=40
Add 5 and 5 to get 10.
30x+25-120=40
Multiply -12 and 10 to get -120.
30x-95=40
Subtract 120 from 25 to get -95.
30x=40+95
Add 95 to both sides.
30x=135
Add 40 and 95 to get 135.
x=\frac{135}{30}
Divide both sides by 30.
x=\frac{9}{2}
Reduce the fraction \frac{135}{30} to lowest terms by extracting and canceling out 15.