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d in (-oo:+oo)
5*(5-(3*d)) = -80 // + 80
5*(5-(3*d))+80 = 0
5*(5-3*d)+80 = 0
5*(5-3*d)+80 = 0
105-15*d = 0
105-15*d = 0
105-15*d = 0 // - 105
-15*d = -105 // : -15
d = -105/(-15)
d = 7
d = 7
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