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-15q+20=-12q-19
We move all terms to the left:
-15q+20-(-12q-19)=0
We get rid of parentheses
-15q+12q+19+20=0
We add all the numbers together, and all the variables
-3q+39=0
We move all terms containing q to the left, all other terms to the right
-3q=-39
q=-39/-3
q=+13
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