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2x+15=115-8x
We move all terms to the left:
2x+15-(115-8x)=0
We add all the numbers together, and all the variables
2x-(-8x+115)+15=0
We get rid of parentheses
2x+8x-115+15=0
We add all the numbers together, and all the variables
10x-100=0
We move all terms containing x to the left, all other terms to the right
10x=100
x=100/10
x=10
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