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-15+3q=-12q+6+18q
We move all terms to the left:
-15+3q-(-12q+6+18q)=0
We add all the numbers together, and all the variables
3q-(6q+6)-15=0
We get rid of parentheses
3q-6q-6-15=0
We add all the numbers together, and all the variables
-3q-21=0
We move all terms containing q to the left, all other terms to the right
-3q=21
q=21/-3
q=-7
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