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3\left(x+2\right)-\left(1-2x\right)=12
Multiply both sides of the equation by 12, the least common multiple of 4,12.
3x+6-\left(1-2x\right)=12
Use the distributive property to multiply 3 by x+2.
3x+6-1-\left(-2x\right)=12
To find the opposite of 1-2x, find the opposite of each term.
3x+6-1+2x=12
The opposite of -2x is 2x.
3x+5+2x=12
Subtract 1 from 6 to get 5.
5x+5=12
Combine 3x and 2x to get 5x.
5x=12-5
Subtract 5 from both sides.
5x=7
Subtract 5 from 12 to get 7.
x=\frac{7}{5}
Divide both sides by 5.