Example

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

Question

$$\pm77\frac{1}{2}\times4\frac{1}{5}$$

Evaluate

$\frac{2\left(±77\right)}{5}$

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