Example

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

Question

$$\frac { \frac { 19 } { 10 } } { 3 + \frac { 3 } { 4 } + \frac { 1 } { 9 } + \frac { 1 } { 7 } }$$

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