Example

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

Question

$$[ \frac { 2 } { 3 } ] 4 \times [ \frac { 1 } { 2 } ] ^ { 2 }$$

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