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8x+15=4x+40
We move all terms to the left:
8x+15-(4x+40)=0
We get rid of parentheses
8x-4x-40+15=0
We add all the numbers together, and all the variables
4x-25=0
We move all terms containing x to the left, all other terms to the right
4x=25
x=25/4
x=6+1/4
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