X-81=-8x

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Solution for X-81=-8x equation: 



X-81=-8X

We move all terms to the left:

X-81-(-8X)=0

We get rid of parentheses

X+8X-81=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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