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