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10x+15=2x+31
We move all terms to the left:
10x+15-(2x+31)=0
We get rid of parentheses
10x-2x-31+15=0
We add all the numbers together, and all the variables
8x-16=0
We move all terms containing x to the left, all other terms to the right
8x=16
x=16/8
x=2
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