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q in (-oo:+oo)
(1800-(2*q))/47 = 12 // - 12
(1800-(2*q))/47-12 = 0
(1800-2*q)/47-12 = 0
(1800-2*q)/47+(-12*47)/47 = 0
1800-2*q-12*47 = 0
1236-2*q = 0
(1236-2*q)/47 = 0
(1236-2*q)/47 = 0 // * 47
1236-2*q = 0
1236-2*q = 0 // - 1236
-2*q = -1236 // : -2
q = -1236/(-2)
q = 618
q = 618
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