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9x+15=3x+9
We move all terms to the left:
9x+15-(3x+9)=0
We get rid of parentheses
9x-3x-9+15=0
We add all the numbers together, and all the variables
6x+6=0
We move all terms containing x to the left, all other terms to the right
6x=-6
x=-6/6
x=-1
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