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4\left(2x-1\right)-12x=3\left(2x+1\right)-12
Multiply both sides of the equation by 12, the least common multiple of 3,4.
8x-4-12x=3\left(2x+1\right)-12
Use the distributive property to multiply 4 by 2x-1.
-4x-4=3\left(2x+1\right)-12
Combine 8x and -12x to get -4x.
-4x-4=6x+3-12
Use the distributive property to multiply 3 by 2x+1.
-4x-4=6x-9
Subtract 12 from 3 to get -9.
-4x-4-6x=-9
Subtract 6x from both sides.
-10x-4=-9
Combine -4x and -6x to get -10x.
-10x=-9+4
Add 4 to both sides.
-10x=-5
Add -9 and 4 to get -5.
x=\frac{-5}{-10}
Divide both sides by -10.
x=\frac{1}{2}
Reduce the fraction \frac{-5}{-10} to lowest terms by extracting and canceling out -5.