81-x=-7

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Solution for 81-x=-7 equation: 



81-x=-7

We move all terms to the left:

81-x-(-7)=0

We add all the numbers together, and all the variables

-1x+88=0

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

-x=-88

x=-88/-1

x=+88

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