Example

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

Question

$$\frac { 2 } { - 5 } , \frac { - 3 } { 7 } , \frac { - 1 } { - 9 } , \frac { 7 } { - 10 }$$

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