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8x+15=4x+31
We move all terms to the left:
8x+15-(4x+31)=0
We get rid of parentheses
8x-4x-31+15=0
We add all the numbers together, and all the variables
4x-16=0
We move all terms containing x to the left, all other terms to the right
4x=16
x=16/4
x=4
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