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d in (-oo:+oo)
5*(1*d+9) = 85 // - 85
5*(1*d+9)-85 = 0
5*(d+9)-85 = 0
5*(d+9)-85 = 0
5*d-40 = 0
5*d-40 = 0
5*d-40 = 0 // + 40
5*d = 40 // : 5
d = 40/5
d = 8
d = 8
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