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9x=3x-72
We move all terms to the left:
9x-(3x-72)=0
We get rid of parentheses
9x-3x+72=0
We add all the numbers together, and all the variables
6x+72=0
We move all terms containing x to the left, all other terms to the right
6x=-72
x=-72/6
x=-12
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