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a in (-oo:+oo)
51/4-a^3-(13/4) = 0
51/4-a^3-13/4 = 0
-1*a^3 = -19/2 // : -1
a^3 = 19/2
a^3 = 19/2 // ^ 1/3
a = (19/2)^(1/3)
a = (19/2)^(1/3)
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