-40=7x+3x

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Solution for -40=7x+3x equation: 



-40=7x+3x

We move all terms to the left:

-40-(7x+3x)=0

We add all the numbers together, and all the variables

-(+10x)-40=0

We get rid of parentheses

-10x-40=0

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

-10x=40

x=40/-10

x=-4

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