Example

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

Question

$$verifythat.(x \times y) \frac{ -1 }{ } = \frac{ x-1 }{ } \times \frac{ y-1 }{ } bytaking$$

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