90=4x+9

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Solution for 90=4x+9 equation: 



90=4x+9

We move all terms to the left:

90-(4x+9)=0

We get rid of parentheses

-4x-9+90=0

We add all the numbers together, and all the variables

-4x+81=0

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

-4x=-81

x=-81/-4

x=20+1/4

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