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d in (-oo:+oo)
-378/5 = 5*d+(4/5)*d-6 // - 5*d+(4/5)*d-6
6-(5*d)-((4/5)*d)-378/5 = 0
(-4/5)*d-5*d-378/5+6 = 0
-29/5*d-348/5 = 0 // + 348/5
-29/5*d = 348/5 // : -29/5
d = 348/5/(-29/5)
d = -12
d = -12
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