x-40=-4x

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Solution for x-40=-4x equation: 



x-40=-4x

We move all terms to the left:

x-40-(-4x)=0

We get rid of parentheses

x+4x-40=0

We add all the numbers together, and all the variables

5x-40=0

We move all terms containing x to the left, all other terms to the right

5x=40

x=40/5

x=8

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