9+x=90-8x

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Solution for 9+x=90-8x equation: 



9+x=90-8x

We move all terms to the left:

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

We add all the numbers together, and all the variables

x-(-8x+90)+9=0

We get rid of parentheses

x+8x-90+9=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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