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d in (-oo:+oo)
5*(3*d+5) = 115 // - 115
5*(3*d+5)-115 = 0
5*(3*d+5)-115 = 0
15*d-90 = 0
15*d-90 = 0
15*d-90 = 0 // + 90
15*d = 90 // : 15
d = 90/15
d = 6
d = 6
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