Example

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

Question

$$\frac { 4 } { 13 } + ( - \frac { 5 } { 8 } ) + ( - \frac { 8 } { 13 } ) + \frac { 89 } { 13 }$$

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