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[ 125x3 + 8y3 ] is not a question or an equation, and it doesn't require an answer

or a solution. It's simply an expression that represents a number. The value of the

number depends on the values of 'x' and 'y', which of course you haven't included,

and it changes in a flash any time either of them changes.

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13y ago

What else can I help you with?