Example

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

Question

$$[ 2 : ( 1 + \frac { 1 } { 2 } ) ] \times ( - 4 \times \frac { 2 } { 2 } ) ]$$

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