(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

(-1x+90)-8x=0

We add all the numbers together, and all the variables

-8x+(-1x+90)=0

We get rid of parentheses

-8x-1x+90=0

We add all the numbers together, and all the variables

-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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