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q in (-oo:+oo)
(1900-(2*q))/47 = 20 // - 20
(1900-(2*q))/47-20 = 0
(1900-2*q)/47-20 = 0
(1900-2*q)/47+(-20*47)/47 = 0
1900-2*q-20*47 = 0
960-2*q = 0
(960-2*q)/47 = 0
(960-2*q)/47 = 0 // * 47
960-2*q = 0
960-2*q = 0 // - 960
-2*q = -960 // : -2
q = -960/(-2)
q = 480
q = 480
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