-138=-7x+9

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Solution for -138=-7x+9 equation: 



-138=-7x+9

We move all terms to the left:

-138-(-7x+9)=0

We get rid of parentheses

7x-9-138=0

We add all the numbers together, and all the variables

7x-147=0

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

7x=147

x=147/7

x=21

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