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-3x+7+8=3\left(5+6x\right)-12
Combine 2x and -5x to get -3x.
-3x+15=3\left(5+6x\right)-12
Add 7 and 8 to get 15.
-3x+15=15+18x-12
Use the distributive property to multiply 3 by 5+6x.
-3x+15=3+18x
Subtract 12 from 15 to get 3.
-3x+15-18x=3
Subtract 18x from both sides.
-21x+15=3
Combine -3x and -18x to get -21x.
-21x=3-15
Subtract 15 from both sides.
-21x=-12
Subtract 15 from 3 to get -12.
x=\frac{-12}{-21}
Divide both sides by -21.
x=\frac{4}{7}
Reduce the fraction \frac{-12}{-21} to lowest terms by extracting and canceling out -3.