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a in (-oo:+oo)
4 = (15-(24*a))/6 // - (15-(24*a))/6
4-((15-(24*a))/6) = 0
4-((15-24*a)/6) = 0
(-1*(15-24*a))/6+4 = 0
(-1*(15-24*a))/6+(4*6)/6 = 0
4*6-1*(15-24*a) = 0
24*a+9 = 0
(24*a+9)/6 = 0
(24*a+9)/6 = 0 // * 6
24*a+9 = 0
24*a+9 = 0 // - 9
24*a = -9 // : 24
a = -9/24
a = -3/8
a = -3/8
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