If the circle \( x^{2}+y^{2}-k x-12 y+4=0 \) touches \( x \)-axis, then \( \mathrm{k}= \)

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If the circle \( x^{2}+y^{2}-k x-12 y+4=0 \) touches \( x \)-axis, then \( \mathrm{k}= \)
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