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9x+18=2x+109
We move all terms to the left:
9x+18-(2x+109)=0
We get rid of parentheses
9x-2x-109+18=0
We add all the numbers together, and all the variables
7x-91=0
We move all terms containing x to the left, all other terms to the right
7x=91
x=91/7
x=13
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