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4x+15=8x-125
We move all terms to the left:
4x+15-(8x-125)=0
We get rid of parentheses
4x-8x+125+15=0
We add all the numbers together, and all the variables
-4x+140=0
We move all terms containing x to the left, all other terms to the right
-4x=-140
x=-140/-4
x=+35
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