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-2x-13=2x+15
We move all terms to the left:
-2x-13-(2x+15)=0
We get rid of parentheses
-2x-2x-15-13=0
We add all the numbers together, and all the variables
-4x-28=0
We move all terms containing x to the left, all other terms to the right
-4x=28
x=28/-4
x=-7
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