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Let $T(x)$ be the tax due on an income of $x$ dollars. The piecewise function for $T(x)$ based on the given information is as follows:
$T(x) = \begin{cases}
0 & \text{if } 0 \leq x \leq 21,000 \\
0.15x & \text{if } 21,000 < x \leq 57,500 \\
0.20x - 2,500 &
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