Example

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

Question

$$S20= \frac{ 20 }{ 2 } \{ 2 \times 5+(20-1) \frac{ -2 }{ 3 }$$

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