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3x-15+4=2x+10
We move all terms to the left:
3x-15+4-(2x+10)=0
We add all the numbers together, and all the variables
3x-(2x+10)-11=0
We get rid of parentheses
3x-2x-10-11=0
We add all the numbers together, and all the variables
x-21=0
We move all terms containing x to the left, all other terms to the right
x=21
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