book Maths Puzzle Numerical Ability

Given the following equation: - 4x + 5y = 20, rewrite in functional notation, then determine the value of f(-2).

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Can you please help me solve this problem? I would greatly appreciate your help! Find each sum or difference, and show all work.</b>

2a/ 2a + 5 - 5/ 2a + 5

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The reciprocal of 5 less than a # is 4 times the reciprocal of twice the #. find the #.
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