Solve for x
x=10
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-13x-21-7+9x+20=-6x+12
Combine -5x and -8x to get -13x.
-13x-28+9x+20=-6x+12
Subtract 7 from -21 to get -28.
-4x-28+20=-6x+12
Combine -13x and 9x to get -4x.
-4x-8=-6x+12
Add -28 and 20 to get -8.
-4x-8+6x=12
Add 6x to both sides.
2x-8=12
Combine -4x and 6x to get 2x.
2x=12+8
Add 8 to both sides.
2x=20
Add 12 and 8 to get 20.
x=\frac{20}{2}
Divide both sides by 2.
x=10
Divide 20 by 2 to get 10.
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