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d in (-oo:+oo)
51/35 = 3*d-(6*d)+3/5 // - 3*d-(6*d)+3/5
6*d-(3*d)+51/35-(3/5) = 0
6*d-3*d+51/35-3/5 = 0
3*d+6/7 = 0 // - 6/7
3*d = -6/7 // : 3
d = -6/7/3
d = -2/7
d = -2/7
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