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3\left(5-6x\right)+12x=42-4\left(5x-2\right)
Multiply both sides of the equation by 12, the least common multiple of 4,2,3.
15-18x+12x=42-4\left(5x-2\right)
Use the distributive property to multiply 3 by 5-6x.
15-6x=42-4\left(5x-2\right)
Combine -18x and 12x to get -6x.
15-6x=42-20x+8
Use the distributive property to multiply -4 by 5x-2.
15-6x=50-20x
Add 42 and 8 to get 50.
15-6x+20x=50
Add 20x to both sides.
15+14x=50
Combine -6x and 20x to get 14x.
14x=50-15
Subtract 15 from both sides.
14x=35
Subtract 15 from 50 to get 35.
x=\frac{35}{14}
Divide both sides by 14.
x=\frac{5}{2}
Reduce the fraction \frac{35}{14} to lowest terms by extracting and canceling out 7.