Example

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

Question

$$\quad 4 \frac { 1 } { 3 } + 3 \frac { 1 } { 6 } - 5 \frac { 1 } { 9 } = ?$$

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