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8x+15=9x-11
We move all terms to the left:
8x+15-(9x-11)=0
We get rid of parentheses
8x-9x+11+15=0
We add all the numbers together, and all the variables
-1x+26=0
We move all terms containing x to the left, all other terms to the right
-x=-26
x=-26/-1
x=+26
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