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q in (-oo:+oo)
(2000-(2*q))/50 = 19 // - 19
(2000-(2*q))/50-19 = 0
(2000-2*q)/50-19 = 0
(2000-2*q)/50+(-19*50)/50 = 0
2000-2*q-19*50 = 0
1050-2*q = 0
(1050-2*q)/50 = 0
(1050-2*q)/50 = 0 // * 50
1050-2*q = 0
1050-2*q = 0 // - 1050
-2*q = -1050 // : -2
q = -1050/(-2)
q = 525
q = 525
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