-9=7x+x=7

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Solution for -9=7x+x=7 equation: 



-9=7x+x=7

We move all terms to the left:

-9-(7x+x)=0

We add all the numbers together, and all the variables

-(+8x)-9=0

We get rid of parentheses

-8x-9=0

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

-8x=9

x=9/-8

x=-1+1/8

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