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-2x+13=8x-3x-8
Combine 7x and -9x to get -2x.
-2x+13=5x-8
Combine 8x and -3x to get 5x.
-2x+13-5x=-8
Subtract 5x from both sides.
-7x+13=-8
Combine -2x and -5x to get -7x.
-7x=-8-13
Subtract 13 from both sides.
-7x=-21
Subtract 13 from -8 to get -21.
x=\frac{-21}{-7}
Divide both sides by -7.
x=3
Divide -21 by -7 to get 3.