Answer :

[tex] Since\ MP=PN,\ MP=9 \\ \\ \\ \\ MN=9+9=18 \\ \\ { \frac{3x}{7x-3} }={ \frac{9}{18} } \\ \\ 18(3x)=9(7x-3) \\ \\ 54x=63x-27 \\ \\ 9x=27 \\ \\ x=3 [/tex]

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