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3\left(x-4\right)-\left(1-x\right)=2x
Multiply both sides of the equation by 6, the least common multiple of 2,6,3.
3x-12-\left(1-x\right)=2x
Use the distributive property to multiply 3 by x-4.
3x-12-1-\left(-x\right)=2x
To find the opposite of 1-x, find the opposite of each term.
3x-12-1+x=2x
The opposite of -x is x.
3x-13+x=2x
Subtract 1 from -12 to get -13.
4x-13=2x
Combine 3x and x to get 4x.
4x-13-2x=0
Subtract 2x from both sides.
2x-13=0
Combine 4x and -2x to get 2x.
2x=13
Add 13 to both sides. Anything plus zero gives itself.
x=\frac{13}{2}
Divide both sides by 2.