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3\left(3x+12\right)+24=4\left(5x-7\right)
Multiply both sides of the equation by 12, the least common multiple of 4,3.
9x+36+24=4\left(5x-7\right)
Use the distributive property to multiply 3 by 3x+12.
9x+60=4\left(5x-7\right)
Add 36 and 24 to get 60.
9x+60=20x-28
Use the distributive property to multiply 4 by 5x-7.
9x+60-20x=-28
Subtract 20x from both sides.
-11x+60=-28
Combine 9x and -20x to get -11x.
-11x=-28-60
Subtract 60 from both sides.
-11x=-88
Subtract 60 from -28 to get -88.
x=\frac{-88}{-11}
Divide both sides by -11.
x=8
Divide -88 by -11 to get 8.