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d in (-oo:+oo)
4*d-6 = (2*(9*d+12))/3 // - (2*(9*d+12))/3
4*d-((2*(9*d+12))/3)-6 = 0
(-2/3)*(9*d+12)+4*d-6 = 0
4*d-2/3*(9*d+12)-6 = 0
4*d-2/3*(9*d+12)-6 = 0
-2*d-8-6 = 0
-2*d-14 = 0
-2*d-14 = 0
-2*d-14 = 0 // + 14
-2*d = 14 // : -2
d = 14/(-2)
d = -7
d = -7
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