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q in (-oo:+oo)
(3/5)*(q-4)+1 = (2/5)*(q+1) // - (2/5)*(q+1)
(3/5)*(q-4)-((2/5)*(q+1))+1 = 0
(3/5)*(q-4)+(-2/5)*(q+1)+1 = 0
3/5*(q-4)-2/5*(q+1)+1 = 0
3/5*(q-4)-2/5*(q+1)+1 = 0
1/5*q-14/5+1 = 0
1/5*q-9/5 = 0
1/5*q-9/5 = 0
1/5*q-9/5 = 0 // + 9/5
1/5*q = 9/5 // : 1/5
q = 9/5/1/5
q = 9
q = 9
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