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18x-18=18x+12-30
We move all terms to the left:
18x-18-(18x+12-30)=0
We add all the numbers together, and all the variables
18x-(18x-18)-18=0
We get rid of parentheses
18x-18x+18-18=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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