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Q in (-oo:+oo)
60-((1/2)*Q) = (1/2)*Q // - (1/2)*Q
60-((1/2)*Q)-((1/2)*Q) = 0
(-1/2)*Q+(-1/2)*Q+60 = 0
60-Q = 0 // - 60
-Q = -60 // * -1
Q = 60
Q = 60
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