-81=2x+7x

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Solution for -81=2x+7x equation:



-81=2x+7x
We move all terms to the left:
-81-(2x+7x)=0
We add all the numbers together, and all the variables
-(+9x)-81=0
We get rid of parentheses
-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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