Example

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

Question

$$\frac { 3 } { 11 } + \frac { - 7 } { 22 } - \frac { 5 } { 33 } + \frac { - 15 } { 44 }$$

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