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d in (-oo:+oo)
6*(4*d+9) = -42 // + 42
6*(4*d+9)+42 = 0
6*(4*d+9)+42 = 0
24*d+96 = 0
24*d+96 = 0
24*d+96 = 0 // - 96
24*d = -96 // : 24
d = -96/24
d = -4
d = -4
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