Example

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

Question

$$12 \frac { 1 } { 2 } + 9 \frac { 5 } { 6 } + 11 \frac { 7 } { 9 }$$

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