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9x-280=x+72
We move all terms to the left:
9x-280-(x+72)=0
We get rid of parentheses
9x-x-72-280=0
We add all the numbers together, and all the variables
8x-352=0
We move all terms containing x to the left, all other terms to the right
8x=352
x=352/8
x=44
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