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d in (-oo:+oo)
16 = 3*d-(6*d)+7 // - 3*d-(6*d)+7
6*d-(3*d)-7+16 = 0
6*d-3*d-7+16 = 0
3*d+9 = 0 // - 9
3*d = -9 // : 3
d = -9/3
d = -3
d = -3
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