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d in (-oo:+oo)
5*(6-(6*d)) = -60 // + 60
5*(6-(6*d))+60 = 0
5*(6-6*d)+60 = 0
5*(6-6*d)+60 = 0
90-30*d = 0
90-30*d = 0
90-30*d = 0 // - 90
-30*d = -90 // : -30
d = -90/(-30)
d = 3
d = 3
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