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((7/8)*x^3)/5-(1/4) = 0
((7/8)*x^3)/5-1/4 = 0
7/40*x^3 = 1/4 // : 7/40
x^3 = 10/7
x^3 = 10/7 // ^ 1/3
x = (10/7)^(1/3)
x = (10/7)^(1/3)
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