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a in (-oo:+oo)
(-1/9)*(27*a-81) = 24 // - 24
(-1/9)*(27*a-81)-24 = 0
-1/9*(27*a-81)-24 = 0
-1/9*(27*a-81)-24 = 0
-3*a-15 = 0
-3*a-15 = 0
-3*a-15 = 0 // + 15
-3*a = 15 // : -3
a = 15/(-3)
a = -5
a = -5
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