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