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Q in (-oo:+oo)
50-((1/4)*Q) = 25 // - 25
50-((1/4)*Q)-25 = 0
(-1/4)*Q-25+50 = 0
25-1/4*Q = 0 // - 25
-1/4*Q = -25 // : -1/4
Q = -25/(-1/4)
Q = 100
Q = 100
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