Example

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

Question

$$\{ f ( - 21 ) + ( - 5 ) ^ { 2 } \} ] \times ( - 4 ) - 20 \} = 3$$

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