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18=9x-45
We move all terms to the left:
18-(9x-45)=0
We get rid of parentheses
-9x+45+18=0
We add all the numbers together, and all the variables
-9x+63=0
We move all terms containing x to the left, all other terms to the right
-9x=-63
x=-63/-9
x=+7
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