Example

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

Question

$$H=( \frac { 3 } { 10 } - \frac { 2 } { 5 } )-( - \frac { 3 } { 2 } - \frac { 4 } { 10 } )$$

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