Example

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

Question

$$\frac { 15 } { 22 } + \frac { 4 } { 9 } + ( \frac { - 15 } { 22 } ) + ( - \frac { 4 } { 9 } )$$

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