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10=-5x+8x+40
Use the distributive property to multiply 8 by x+5.
10=3x+40
Combine -5x and 8x to get 3x.
3x+40=10
Swap sides so that all variable terms are on the left hand side.
3x=10-40
Subtract 40 from both sides.
3x=-30
Subtract 40 from 10 to get -30.
x=\frac{-30}{3}
Divide both sides by 3.
x=-10
Divide -30 by 3 to get -10.