40=7x+20-2x

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Solution for 40=7x+20-2x equation: 



40=7x+20-2x

We move all terms to the left:

40-(7x+20-2x)=0

We add all the numbers together, and all the variables

-(5x+20)+40=0

We get rid of parentheses

-5x-20+40=0

We add all the numbers together, and all the variables

-5x+20=0

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

-5x=-20

x=-20/-5

x=+4

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