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-89+9x=79+15x
We move all terms to the left:
-89+9x-(79+15x)=0
We add all the numbers together, and all the variables
9x-(15x+79)-89=0
We get rid of parentheses
9x-15x-79-89=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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