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5x-15=15-2x
We move all terms to the left:
5x-15-(15-2x)=0
We add all the numbers together, and all the variables
5x-(-2x+15)-15=0
We get rid of parentheses
5x+2x-15-15=0
We add all the numbers together, and all the variables
7x-30=0
We move all terms containing x to the left, all other terms to the right
7x=30
x=30/7
x=4+2/7
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