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d in (-oo:+oo)
4*d+9 = 39-6*d // - 39-6*d
4*d-(-6*d)-39+9 = 0
4*d+6*d-39+9 = 0
10*d-30 = 0 // + 30
10*d = 30 // : 10
d = 30/10
d = 3
d = 3
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