7x-81=-2x

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



7x-81=-2x
We move all terms to the left:
7x-81-(-2x)=0
We get rid of parentheses
7x+2x-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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