[tex]\\ \rm\rightarrowtail \dfrac{NM}{NO}=\dfrac{KM}{KL}[/tex]
[tex]\\ \rm\rightarrowtail \dfrac{x}{7}=\dfrac{20}{2x}[/tex]
[tex]\\ \rm\rightarrowtail 2x^2=140[/tex]
[tex]\\ \rm\rightarrowtail x^2=70[/tex]
[tex]\\ \rm\rightarrowtail x=\sqrt{70}[/tex]
