Example

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

Question

$$4 \frac { 2 } { 3 } - 3 \frac { 3 } { 4 } - 2 \frac { 1 } { 6 }$$

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