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6x-9\left(2x+1\right)=-18\left(-\frac{3x+9}{3}-2+x\right)-6x
Multiply both sides of the equation by 6, the least common multiple of 2,3.
6x-18x-9=-18\left(-\frac{3x+9}{3}-2+x\right)-6x
Use the distributive property to multiply -9 by 2x+1.
-12x-9=-18\left(-\frac{3x+9}{3}-2+x\right)-6x
Combine 6x and -18x to get -12x.
-12x-9=-18\left(-\left(3+x\right)-2+x\right)-6x
Divide each term of 3x+9 by 3 to get 3+x.
-12x-9=-18\left(-3-x-2+x\right)-6x
To find the opposite of 3+x, find the opposite of each term.
-12x-9=-18\left(-5-x+x\right)-6x
Subtract 2 from -3 to get -5.
-12x-9=-18\left(-5\right)-6x
Combine -x and x to get 0.
-12x-9=90-6x
Multiply -18 and -5 to get 90.
-12x-9+6x=90
Add 6x to both sides.
-6x-9=90
Combine -12x and 6x to get -6x.
-6x=90+9
Add 9 to both sides.
-6x=99
Add 90 and 9 to get 99.
x=\frac{99}{-6}
Divide both sides by -6.
x=-\frac{33}{2}
Reduce the fraction \frac{99}{-6} to lowest terms by extracting and canceling out 3.