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d in (-oo:+oo)
(1/2)*d-6 = 5*d-87/10 // - 5*d-87/10
(1/2)*d-(5*d)-(-87/10)-6 = 0
(1/2)*d-5*d+87/10-6 = 0
27/10-9/2*d = 0 // - 27/10
-9/2*d = -27/10 // : -9/2
d = -27/10/(-9/2)
d = 3/5
d = 3/5
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