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a in (-oo:+oo)
(a^1)/3 = 15 // - 15
(a^1)/3-15 = 0
a/3-15 = 0
1/3*a-15 = 0 // + 15
1/3*a = 15 // : 1/3
a = 15/1/3
a = 45
a = 45
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