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Q in (-oo:+oo)
18 = (1200-(2*Q))/43 // - (1200-(2*Q))/43
18-((1200-(2*Q))/43) = 0
18-((1200-2*Q)/43) = 0
(-1*(1200-2*Q))/43+18 = 0
(-1*(1200-2*Q))/43+(18*43)/43 = 0
18*43-1*(1200-2*Q) = 0
2*Q-426 = 0
(2*Q-426)/43 = 0
(2*Q-426)/43 = 0 // * 43
2*Q-426 = 0
2*Q-426 = 0 // + 426
2*Q = 426 // : 2
Q = 426/2
Q = 213
Q = 213
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