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-2x-15=2x+9
We move all terms to the left:
-2x-15-(2x+9)=0
We get rid of parentheses
-2x-2x-9-15=0
We add all the numbers together, and all the variables
-4x-24=0
We move all terms containing x to the left, all other terms to the right
-4x=24
x=24/-4
x=-6
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