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x+4=6x-81
We move all terms to the left:
x+4-(6x-81)=0
We get rid of parentheses
x-6x+81+4=0
We add all the numbers together, and all the variables
-5x+85=0
We move all terms containing x to the left, all other terms to the right
-5x=-85
x=-85/-5
x=+17
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