Example

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

Question

$$\left. \begin{array} { l } { 15 - 6 + 7 \times 63 \div 9 - 40 } \\ { 50 } \end{array} \right.$$

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