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((5*x)^3)/5 = 135 // - 135
((5*x)^3)/5-135 = 0
25*x^3 = 135 // : 25
x^3 = 27/5
x^3 = 27/5 // ^ 1/3
x = (27/5)^(1/3)
x = (27/5)^(1/3)
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