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q in (-oo:+oo)
20 = (1400-q)/49 // - (1400-q)/49
20-((1400-q)/49) = 0
(-1*(1400-q))/49+20 = 0
(-1*(1400-q))/49+(20*49)/49 = 0
20*49-1*(1400-q) = 0
q-420 = 0
(q-420)/49 = 0
(q-420)/49 = 0 // * 49
q-420 = 0
q-420 = 0 // + 420
q = 420
q = 420
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