Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\left. \begin{array} { l } { x } \\ { 6 : 9 : x : 15 } \end{array} \right.$$

Evaluate

$x,\ \frac{2}{45x}$

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