Find the equations of the bisectors of the angles between the lines...

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Find the equations of the bisectors of the angles between the lines
\[
3 x-4 y+7=0 \text { and } 12 x-5 y-8=0 \text {. }
\]
Also prove that the bisectors are at right angles to each other.
\( \mathrm{P} \)
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