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12=2q-3q
We move all terms to the left:
12-(2q-3q)=0
We add all the numbers together, and all the variables
-(-1q)+12=0
We get rid of parentheses
1q+12=0
We add all the numbers together, and all the variables
q+12=0
We move all terms containing q to the left, all other terms to the right
q=-12
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