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a in (-oo:+oo)
5 = 15/6-((24*a)/6) // - 15/6-((24*a)/6)
(24*a)/6-(15/6)+5 = 0
(24*a)/6-5/2+5 = 0
4*a+5/2 = 0 // - 5/2
4*a = -5/2 // : 4
a = -5/2/4
a = -5/8
a = -5/8
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