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q in (-oo:+oo)
q/4+4/5 = (5*q+16)/20 // - (5*q+16)/20
q/4-((5*q+16)/20)+4/5 = 0
(-1*(5*q+16))/20+q/4+4/5 = 0
(-1*4*5*(5*q+16))/(4*5*20)+(5*20*q)/(4*5*20)+(20*4^2)/(4*5*20) = 0
5*20*q-1*4*5*(5*q+16)+20*4^2 = 0
320-320 = 0
0 = 0
0/(4*5*20) = 0
0/(4*5*20) = 0 // * 4*5*20
0 = 0
q belongs to the empty set
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