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3x+15=8x-4
We move all terms to the left:
3x+15-(8x-4)=0
We get rid of parentheses
3x-8x+4+15=0
We add all the numbers together, and all the variables
-5x+19=0
We move all terms containing x to the left, all other terms to the right
-5x=-19
x=-19/-5
x=3+4/5
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