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q in (-oo:+oo)
q/2+8/9 = (9*q+16)/18 // - (9*q+16)/18
q/2-((9*q+16)/18)+8/9 = 0
(-1*(9*q+16))/18+q/2+8/9 = 0
(-1*2*9*(9*q+16))/(2*9*18)+(9*18*q)/(2*9*18)+(2*8*18)/(2*9*18) = 0
9*18*q-1*2*9*(9*q+16)+2*8*18 = 0
288-288 = 0
0 = 0
0/(2*9*18) = 0
0/(2*9*18) = 0 // * 2*9*18
0 = 0
q belongs to the empty set
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