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=40-2Q-Q2.=13+4Q
We move all terms to the left:
-(40-2Q-Q2.)=0
We add all the numbers together, and all the variables
-(-2Q-Q2.+40)=0
We get rid of parentheses
2Q+Q2.-40=0
We move all terms containing Q to the left, all other terms to the right
2Q+Q2.=40
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