-81=-4x-5x

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Solution for -81=-4x-5x equation: 



-81=-4x-5x

We move all terms to the left:

-81-(-4x-5x)=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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