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d in (-oo:+oo)
d/4 = 4*d-60 // - 4*d-60
d/4-(4*d)+60 = 0
d/4-4*d+60 = 0
60-15/4*d = 0 // - 60
-15/4*d = -60 // : -15/4
d = -60/(-15/4)
d = 16
d = 16
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