book Maths Puzzle Numerical Ability

Please help me perform this operation and simplify
6(16x^4)^(1/3)-5(2x)^(1/3)-2(250x^7)^(1/3)

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book Other Question
solve: 1/e^-x^2=(e^3x)*1/e^2 Please help me solve this equation:2x=-x+9