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-9x+18=3x+141
We move all terms to the left:
-9x+18-(3x+141)=0
We get rid of parentheses
-9x-3x-141+18=0
We add all the numbers together, and all the variables
-12x-123=0
We move all terms containing x to the left, all other terms to the right
-12x=123
x=123/-12
x=-10+1/4
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