-81-3x=-9x+21

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Solution for -81-3x=-9x+21 equation: 



-81-3x=-9x+21

We move all terms to the left:

-81-3x-(-9x+21)=0

We get rid of parentheses

-3x+9x-21-81=0

We add all the numbers together, and all the variables

6x-102=0

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

6x=102

x=102/6

x=17

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