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

x+1/2=-3/4

3/5x=-9

3x-3/5=12/5

5-5x=7x-3(5x-6)
Hi Tutors:

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"Area of a rectangle." The width of a rectangle