Example

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

Question

$$\left. \begin{array} { l } { 50 - ( 15 : 5 ) } \\ { ( 50 - 15 ) : 5 } \end{array} \right.$$

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