Example

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

Question

$$2 \frac { 4 } { 5 } - 3 \frac { 1 } { 7 } + 2 \frac { 5 } { 9 }$$

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