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d in (-oo:+oo)
99/2 = (5/6)*d-(7*d)-6 // - (5/6)*d-(7*d)-6
7*d-((5/6)*d)+99/2+6 = 0
(-5/6)*d+7*d+99/2+6 = 0
37/6*d+111/2 = 0 // - 111/2
37/6*d = -111/2 // : 37/6
d = -111/2/37/6
d = -9
d = -9
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