Example

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

Question

$$\int _ { 0 } ^ { 1 } \int _ { 1 } ^ { 2 } ( x + e ^ { - x } ) d x d x$$

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