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