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Triangles are similar ,
Thus :
[tex] \frac{9}{3} = \frac{6}{x} \\ [/tex]
[tex]3 = \frac{6}{x} \\ [/tex]
[tex] \frac{6}{x} = 3 \\ [/tex]
Inverse both sides
[tex] \frac{x}{6} = \frac{1}{3} \\ [/tex]
Multiply sides by 6
[tex]6 \times \frac{x}{6} = 6 \times \frac{1}{3} \\ [/tex]
[tex]x = 2 \times 3 \times \frac{1}{3} \\ [/tex]
[tex]x = 2[/tex]
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