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2x=x+2x+15
We move all terms to the left:
2x-(x+2x+15)=0
We add all the numbers together, and all the variables
2x-(3x+15)=0
We get rid of parentheses
2x-3x-15=0
We add all the numbers together, and all the variables
-1x-15=0
We move all terms containing x to the left, all other terms to the right
-x=15
x=15/-1
x=-15
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