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q in (-oo:+oo)
(1200-(2*q))/49 = 18 // - 18
(1200-(2*q))/49-18 = 0
(1200-2*q)/49-18 = 0
(1200-2*q)/49+(-18*49)/49 = 0
1200-2*q-18*49 = 0
318-2*q = 0
(318-2*q)/49 = 0
(318-2*q)/49 = 0 // * 49
318-2*q = 0
318-2*q = 0 // - 318
-2*q = -318 // : -2
q = -318/(-2)
q = 159
q = 159
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