90=3x-9=x+7

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Solution for 90=3x-9=x+7 equation: 



90=3x-9=x+7

We move all terms to the left:

90-(3x-9)=0

We get rid of parentheses

-3x+9+90=0

We add all the numbers together, and all the variables

-3x+99=0

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

-3x=-99

x=-99/-3

x=+33

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