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5x+15-6x-6=9x-10\left(2x-4\right)+3x-12+2
Use the distributive property to multiply -6 by x+1.
-x+15-6=9x-10\left(2x-4\right)+3x-12+2
Combine 5x and -6x to get -x.
-x+9=9x-10\left(2x-4\right)+3x-12+2
Subtract 6 from 15 to get 9.
-x+9=9x-20x+40+3x-12+2
Use the distributive property to multiply -10 by 2x-4.
-x+9=-11x+40+3x-12+2
Combine 9x and -20x to get -11x.
-x+9=-8x+40-12+2
Combine -11x and 3x to get -8x.
-x+9=-8x+28+2
Subtract 12 from 40 to get 28.
-x+9=-8x+30
Add 28 and 2 to get 30.
-x+9+8x=30
Add 8x to both sides.
7x+9=30
Combine -x and 8x to get 7x.
7x=30-9
Subtract 9 from both sides.
7x=21
Subtract 9 from 30 to get 21.
x=\frac{21}{7}
Divide both sides by 7.
x=3
Divide 21 by 7 to get 3.