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d in (-oo:+oo)
-37/6 = (4/7)*d+(1/2)*d-7 // - (4/7)*d+(1/2)*d-7
7-((4/7)*d)-((1/2)*d)-37/6 = 0
(-4/7)*d+(-1/2)*d-37/6+7 = 0
5/6-15/14*d = 0 // - 5/6
-15/14*d = -5/6 // : -15/14
d = -5/6/(-15/14)
d = 7/9
d = 7/9
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