exam Maths Puzzle Numerical Ability

please, help me to answer the quastion: explain the difference between simplifying an expression and solving an equation.

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exam Other Question

Simplify the product : (x/2-2/5)(2/5-x/2)-x^2+2x Horriable at fractions any help would be greatly appreciated. It is a fraction with the exponet being the 2/3 and 1/3.

(25x^3) 2/3
(125xy^2) 1/3