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d in (-oo:+oo)
5*d-(3*d)+8 = 24 // - 24
5*d-(3*d)-24+8 = 0
5*d-3*d-24+8 = 0
2*d-16 = 0 // + 16
2*d = 16 // : 2
d = 16/2
d = 8
d = 8
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