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2x-3x+21=-6\left(x+4\right)
Use the distributive property to multiply -3 by x-7.
-x+21=-6\left(x+4\right)
Combine 2x and -3x to get -x.
-x+21=-6x-24
Use the distributive property to multiply -6 by x+4.
-x+21+6x=-24
Add 6x to both sides.
5x+21=-24
Combine -x and 6x to get 5x.
5x=-24-21
Subtract 21 from both sides.
5x=-45
Subtract 21 from -24 to get -45.
x=\frac{-45}{5}
Divide both sides by 5.
x=-9
Divide -45 by 5 to get -9.