Example

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

Question

$$\frac{ 7 }{ 12 } - 2 \frac { 3 } { 5 } + \frac{ 1 }{ 2 }$$

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