Solve for x
x=-10
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15x-x+40=10x
Multiply both sides of the equation by 5.
15x-x+40-10x=0
Subtract 10x from both sides.
5x-x+40=0
Combine 15x and -10x to get 5x.
5x-x=-40
Subtract 40 from both sides. Anything subtracted from zero gives its negation.
4x=-40
Combine 5x and -x to get 4x.
x=\frac{-40}{4}
Divide both sides by 4.
x=-10
Divide -40 by 4 to get -10.
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