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7/4-(((5/6)*x^3)/20) = 0
(-1/24)*x^3+7/4 = 0
-1/24*x^3 = -7/4 // : -1/24
x^3 = 42
x^3 = 42 // ^ 1/3
x = 42^(1/3)
x = 42^(1/3)
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