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