-x+40=-4x=90

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Solution for -x+40=-4x=90 equation: 



-x+40=-4x=90

We move all terms to the left:

-x+40-(-4x)=0

We add all the numbers together, and all the variables

-1x-(-4x)+40=0

We get rid of parentheses

-1x+4x+40=0

We add all the numbers together, and all the variables

3x+40=0

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

3x=-40

x=-40/3

x=-13+1/3

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