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Q in (-oo:+oo)
20 = (1500-(2*Q))/43 // - (1500-(2*Q))/43
20-((1500-(2*Q))/43) = 0
20-((1500-2*Q)/43) = 0
(-1*(1500-2*Q))/43+20 = 0
(-1*(1500-2*Q))/43+(20*43)/43 = 0
20*43-1*(1500-2*Q) = 0
2*Q-640 = 0
(2*Q-640)/43 = 0
(2*Q-640)/43 = 0 // * 43
2*Q-640 = 0
2*Q-640 = 0 // + 640
2*Q = 640 // : 2
Q = 640/2
Q = 320
Q = 320
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