exam Maths Puzzle Numerical Ability

A company buysa copier for $10,000. The value of the copier is $10,000(1-n/20) after n years. After how many years will the value of the copier be $6,500?

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i need help with this question i have no idea how to beging to solve it.

it says : subtract the lower polynomial from the upper one

2x^2y-5xy^2+2 and
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