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15=19+q
We move all terms to the left:
15-(19+q)=0
We add all the numbers together, and all the variables
-(q+19)+15=0
We get rid of parentheses
-q-19+15=0
We add all the numbers together, and all the variables
-1q-4=0
We move all terms containing q to the left, all other terms to the right
-q=4
q=4/-1
q=-4
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