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d in (-oo:+oo)
5*(6*d+9) = -75 // + 75
5*(6*d+9)+75 = 0
5*(6*d+9)+75 = 0
30*d+120 = 0
30*d+120 = 0
30*d+120 = 0 // - 120
30*d = -120 // : 30
d = -120/30
d = -4
d = -4
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