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q in (-oo:+oo)
10 = (1800-(2*q))/43 // - (1800-(2*q))/43
10-((1800-(2*q))/43) = 0
10-((1800-2*q)/43) = 0
(-1*(1800-2*q))/43+10 = 0
(-1*(1800-2*q))/43+(10*43)/43 = 0
10*43-1*(1800-2*q) = 0
2*q-1370 = 0
(2*q-1370)/43 = 0
(2*q-1370)/43 = 0 // * 43
2*q-1370 = 0
2*q-1370 = 0 // + 1370
2*q = 1370 // : 2
q = 1370/2
q = 685
q = 685
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