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(9)(3)=x+18
We move all terms to the left:
(9)(3)-(x+18)=0
We get rid of parentheses
-x-18+93=0
We add all the numbers together, and all the variables
-1x+75=0
We move all terms containing x to the left, all other terms to the right
-x=-75
x=-75/-1
x=+75
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