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-5x+15=6x+81
We move all terms to the left:
-5x+15-(6x+81)=0
We get rid of parentheses
-5x-6x-81+15=0
We add all the numbers together, and all the variables
-11x-66=0
We move all terms containing x to the left, all other terms to the right
-11x=66
x=66/-11
x=-6
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