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=-50+Q
We move all terms to the left:
-(-50+Q)=0
We add all the numbers together, and all the variables
-(Q-50)=0
We get rid of parentheses
-Q+50=0
We add all the numbers together, and all the variables
-1Q+50=0
We move all terms containing Q to the left, all other terms to the right
-Q=-50
Q=-50/-1
Q=+50
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