Example

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

Question

$$27 \frac{ 1 }{ 2 } +15 \frac{ 3 }{ 4 } -12 \frac{ 2 }{ 5 } +18 \frac{ 4 }{ 5 } =$$

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