40=15x-7x

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Solution for 40=15x-7x equation: 



40=15x-7x

We move all terms to the left:

40-(15x-7x)=0

We add all the numbers together, and all the variables

-(+8x)+40=0

We get rid of parentheses

-8x+40=0

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

-8x=-40

x=-40/-8

x=+5

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