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-81-3x=-9x+15
We move all terms to the left:
-81-3x-(-9x+15)=0
We get rid of parentheses
-3x+9x-15-81=0
We add all the numbers together, and all the variables
6x-96=0
We move all terms containing x to the left, all other terms to the right
6x=96
x=96/6
x=16
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