Resolver 4=21=(1-11)(42-31)/(82-61) | 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

$$4=21=(1-11)(42-31)/(82-61)$$