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d in (-oo:+oo)
131/14 = (4/7)*d-5*d+1/2 // - (4/7)*d-5*d+1/2
131/14-(-5*d)-((4/7)*d)-(1/2) = 0
5*d+(-4/7)*d+131/14-1/2 = 0
31/7*d+62/7 = 0 // - 62/7
31/7*d = -62/7 // : 31/7
d = -62/7/31/7
d = -2
d = -2
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