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4x-15=2x+15
We move all terms to the left:
4x-15-(2x+15)=0
We get rid of parentheses
4x-2x-15-15=0
We add all the numbers together, and all the variables
2x-30=0
We move all terms containing x to the left, all other terms to the right
2x=30
x=30/2
x=15
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