Example

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

Question

$$3+x { y }^{ 2 } -3xyz- \frac{ 1 }{ 2 } ( { x }^{ 2 } y+ { y }^{ 2 } z)$$

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