-87+9x-3x=81

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Solution for -87+9x-3x=81 equation: 



-87+9x-3x=81

We move all terms to the left:

-87+9x-3x-(81)=0

We add all the numbers together, and all the variables

6x-168=0

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

6x=168

x=168/6

x=28

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