Example

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

Question

$$\frac { 10 \times 10 \times ( 10 + 1 ) + - 9 \times 10 } { 2 }$$

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