5 more than twice the cube of a number

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5 more than twice the cube of a number.

Take this algebraic expression in pieces.

The phrase a number means an arbitrary variable, let's call it x.
x

The cube of a number means we raise it to a power of 3
x^3

Twice the cube of a number means we multiply x^3 by 2
2x^3

5 more than twice the cube of a number means we multiply 2x^3 by 5
5(2x^3)

Simplifying, we get:
10x^3