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q in (-oo:+oo)
(1900-(2*q))/45 = 14 // - 14
(1900-(2*q))/45-14 = 0
(1900-2*q)/45-14 = 0
(1900-2*q)/45+(-14*45)/45 = 0
1900-2*q-14*45 = 0
1270-2*q = 0
(1270-2*q)/45 = 0
(1270-2*q)/45 = 0 // * 45
1270-2*q = 0
1270-2*q = 0 // - 1270
-2*q = -1270 // : -2
q = -1270/(-2)
q = 635
q = 635
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