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