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d in (-oo:+oo)
7/8-((4/7)*d) = 109/88 // - 109/88
7/8-((4/7)*d)-(109/88) = 0
(-4/7)*d+7/8-109/88 = 0
-4/7*d-4/11 = 0 // + 4/11
-4/7*d = 4/11 // : -4/7
d = 4/11/(-4/7)
d = -7/11
d = -7/11
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