Example

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

Question

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

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