Example

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

Question

$$A = \frac { 9 } { 10 } \div \frac { 10 } { 11 } \div \frac { 11 } { 12 }$$

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