Example

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

Question

$$\frac { 2 } { 3 } + \frac { ( - 4 ) } { 5 } + \frac { 7 } { 15 } + \frac { ( - 11 ) } { 20 }$$

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