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D( d )
15*d = 0
5*d = 0
15*d = 0
15*d = 0
15*d = 0 // : 15
d = 0
5*d = 0
5*d = 0
5*d = 0 // : 5
d = 0
d in (-oo:0) U (0:+oo)
2/(15*d)-(3/(5*d)) = 35 // - 35
2/(15*d)-(3/(5*d))-35 = 0
2/(15*d)+(-3/5)*d^-1-35 = 0
-7/15*d^-1 = 35 // : -7/15
d^-1 = -75
-1 < 0
1/(d^1) = -75 // * d^1
1 = -75*d^1 // : -75
-1/75 = d^1
d = -1/75
d = -1/75
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