Example

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

Question

$$\left. \begin{array} { l } { \frac { 7 } { 10 } + \frac { 11 } { 20 } } \end{array} \right.$$

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