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d in (-oo:+oo)
-16 = 3*d-(7*d)+8 // - 3*d-(7*d)+8
7*d-(3*d)-16-8 = 0
7*d-3*d-16-8 = 0
4*d-24 = 0 // + 24
4*d = 24 // : 4
d = 24/4
d = 6
d = 6
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