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12q=15q-18
We move all terms to the left:
12q-(15q-18)=0
We get rid of parentheses
12q-15q+18=0
We add all the numbers together, and all the variables
-3q+18=0
We move all terms containing q to the left, all other terms to the right
-3q=-18
q=-18/-3
q=+6
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