90=x+8x

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Solution for 90=x+8x equation: 



90=x+8x

We move all terms to the left:

90-(x+8x)=0

We add all the numbers together, and all the variables

-(+9x)+90=0

We get rid of parentheses

-9x+90=0

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

-9x=-90

x=-90/-9

x=+10

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