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d in (-oo:+oo)
4*(5*d+8) = 72 // - 72
4*(5*d+8)-72 = 0
4*(5*d+8)-72 = 0
20*d-40 = 0
20*d-40 = 0
20*d-40 = 0 // + 40
20*d = 40 // : 20
d = 40/20
d = 2
d = 2
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