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3\times 3\left(2x+1\right)-12=4\times 2\left(2x+1\right)
Multiply both sides of the equation by 12, the least common multiple of 4,3.
9\left(2x+1\right)-12=4\times 2\left(2x+1\right)
Multiply 3 and 3 to get 9.
18x+9-12=4\times 2\left(2x+1\right)
Use the distributive property to multiply 9 by 2x+1.
18x-3=4\times 2\left(2x+1\right)
Subtract 12 from 9 to get -3.
18x-3=8\left(2x+1\right)
Multiply 4 and 2 to get 8.
18x-3=16x+8
Use the distributive property to multiply 8 by 2x+1.
18x-3-16x=8
Subtract 16x from both sides.
2x-3=8
Combine 18x and -16x to get 2x.
2x=8+3
Add 3 to both sides.
2x=11
Add 8 and 3 to get 11.
x=\frac{11}{2}
Divide both sides by 2.