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