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-81=3x-27
We move all terms to the left:
-81-(3x-27)=0
We get rid of parentheses
-3x+27-81=0
We add all the numbers together, and all the variables
-3x-54=0
We move all terms containing x to the left, all other terms to the right
-3x=54
x=54/-3
x=-18
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