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