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Q in (-oo:+oo)
20 = (1500-(2*Q))/42 // - (1500-(2*Q))/42
20-((1500-(2*Q))/42) = 0
20-((1500-2*Q)/42) = 0
(-1*(1500-2*Q))/42+20 = 0
(-1*(1500-2*Q))/42+(20*42)/42 = 0
20*42-1*(1500-2*Q) = 0
2*Q-660 = 0
(2*Q-660)/42 = 0
(2*Q-660)/42 = 0 // * 42
2*Q-660 = 0
2*Q-660 = 0 // + 660
2*Q = 660 // : 2
Q = 660/2
Q = 330
Q = 330
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