40=3x-x

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Solution for 40=3x-x equation: 



40=3x-x

We move all terms to the left:

40-(3x-x)=0

We add all the numbers together, and all the variables

-(+2x)+40=0

We get rid of parentheses

-2x+40=0

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

-2x=-40

x=-40/-2

x=+20

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