Example

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

Question

$$\frac{ 1 }{ 2 } \sqrt{ 14 } \times \frac { 2 } { 7 } \sqrt{ 21 }$$

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