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2x-15=4x-31
We move all terms to the left:
2x-15-(4x-31)=0
We get rid of parentheses
2x-4x+31-15=0
We add all the numbers together, and all the variables
-2x+16=0
We move all terms containing x to the left, all other terms to the right
-2x=-16
x=-16/-2
x=+8
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