-90=90-9x

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Solution for -90=90-9x equation: 



-90=90-9x

We move all terms to the left:

-90-(90-9x)=0

We add all the numbers together, and all the variables

-(-9x+90)-90=0

We get rid of parentheses

9x-90-90=0

We add all the numbers together, and all the variables

9x-180=0

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

9x=180

x=180/9

x=20

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