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d in (-oo:+oo)
4*d-6 = (3*(9*d+12))/2 // - (3*(9*d+12))/2
4*d-((3*(9*d+12))/2)-6 = 0
(-3/2)*(9*d+12)+4*d-6 = 0
4*d-3/2*(9*d+12)-6 = 0
4*d-3/2*(9*d+12)-6 = 0
-19/2*d-18-6 = 0
-19/2*d-24 = 0
-19/2*d-24 = 0
-19/2*d-24 = 0 // + 24
-19/2*d = 24 // : -19/2
d = 24/(-19/2)
d = -48/19
d = -48/19
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