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3\times 3\left(2x+1\right)-4\times 2\left(2x-1\right)=12
Multiply both sides of the equation by 12, the least common multiple of 4,3.
9\left(2x+1\right)-4\times 2\left(2x-1\right)=12
Multiply 3 and 3 to get 9.
18x+9-4\times 2\left(2x-1\right)=12
Use the distributive property to multiply 9 by 2x+1.
18x+9-8\left(2x-1\right)=12
Multiply -4 and 2 to get -8.
18x+9-16x+8=12
Use the distributive property to multiply -8 by 2x-1.
2x+9+8=12
Combine 18x and -16x to get 2x.
2x+17=12
Add 9 and 8 to get 17.
2x=12-17
Subtract 17 from both sides.
2x=-5
Subtract 17 from 12 to get -5.
x=\frac{-5}{2}
Divide both sides by 2.
x=-\frac{5}{2}
Fraction \frac{-5}{2} can be rewritten as -\frac{5}{2} by extracting the negative sign.