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9x+72=4x+122
We move all terms to the left:
9x+72-(4x+122)=0
We get rid of parentheses
9x-4x-122+72=0
We add all the numbers together, and all the variables
5x-50=0
We move all terms containing x to the left, all other terms to the right
5x=50
x=50/5
x=10
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