Example

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

Question

$$\frac { 47 } { 140 } + \frac { 9 } { 40 } + \frac { 19 } { 190 } + \frac { 91 } { 300 }$$

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