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99-9x=9x-27
We move all terms to the left:
99-9x-(9x-27)=0
We get rid of parentheses
-9x-9x+27+99=0
We add all the numbers together, and all the variables
-18x+126=0
We move all terms containing x to the left, all other terms to the right
-18x=-126
x=-126/-18
x=+7
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