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18x-9+7x=11x+9
We move all terms to the left:
18x-9+7x-(11x+9)=0
We add all the numbers together, and all the variables
25x-(11x+9)-9=0
We get rid of parentheses
25x-11x-9-9=0
We add all the numbers together, and all the variables
14x-18=0
We move all terms containing x to the left, all other terms to the right
14x=18
x=18/14
x=1+2/7
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