Example

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

Question

$$(7 \frac{ 1 }{ 2 } \times 3 \frac{ 1 }{ 4 } -7 \frac{ 1 }{ 2 } \times 2 \frac{ 1 }{ 4 } )$$

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