Resolver plus/minus 77 1/2 * 4 1/5 | Equatix - Math Solver

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Example

3(r+2s)=2t-4

a⋅(b-2)=3b

3(r+2s)=2t-4

a⋅(b-2)=3b

Question

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