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d in (-oo:+oo)
(-1/2)*d+8 = (2/7)*d+113/14 // - (2/7)*d+113/14
(-1/2)*d-((2/7)*d)-(113/14)+8 = 0
(-1/2)*d+(-2/7)*d-113/14+8 = 0
-11/14*d-1/14 = 0 // + 1/14
-11/14*d = 1/14 // : -11/14
d = 1/14/(-11/14)
d = -1/11
d = -1/11
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