90=5x+7+4x+2

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Solution for 90=5x+7+4x+2 equation: 



90=5x+7+4x+2

We move all terms to the left:

90-(5x+7+4x+2)=0

We add all the numbers together, and all the variables

-(9x+9)+90=0

We get rid of parentheses

-9x-9+90=0

We add all the numbers together, and all the variables

-9x+81=0

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

-9x=-81

x=-81/-9

x=+9

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