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d in (-oo:+oo)
193/42 = (3/7)*d-4*d+4 // - (3/7)*d-4*d+4
193/42-(-4*d)-((3/7)*d)-4 = 0
4*d+(-3/7)*d+193/42-4 = 0
25/7*d+25/42 = 0 // - 25/42
25/7*d = -25/42 // : 25/7
d = -25/42/25/7
d = -1/6
d = -1/6
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