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-3x-15=3x+15
We move all terms to the left:
-3x-15-(3x+15)=0
We get rid of parentheses
-3x-3x-15-15=0
We add all the numbers together, and all the variables
-6x-30=0
We move all terms containing x to the left, all other terms to the right
-6x=30
x=30/-6
x=-5
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