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8x+15=6x-40
We move all terms to the left:
8x+15-(6x-40)=0
We get rid of parentheses
8x-6x+40+15=0
We add all the numbers together, and all the variables
2x+55=0
We move all terms containing x to the left, all other terms to the right
2x=-55
x=-55/2
x=-27+1/2
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