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We move all terms to the left:</span>

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We add all the numbers together, and all the variables</span>

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We move all terms containing y to the left, all other terms to the right</span>


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Answer: They are inverses of each other
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Explanation:
We'll need to compute h(f(x)) and f(h(x)) to see if we get x each time.

and,

Both composite functions lead to x each time.
The equations h(f(x)) = x and f(h(x)) = x being true means each function is the inverse of the other.
A is the answer because you need to know how much he spends. If wrong sorry.