Example

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

Question

$$25 - \frac { 1 } { 2 } \{ 5 + 4 - ( 8 + 2 - \frac { 1 + 3 } { 1 + 3 } ) \}$$

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