Example

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

Question

$$\frac { ( \frac { 5 } { 30 } ) } { ( \frac { 30 } { 7 } ) ^ { - } }$$

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