Example

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

Question

$$\frac { - 2 } { 5 } = \frac { - 2 \times 9 } { 5 \times 9 } = \frac { - 18 } { 45 }$$

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