Example

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

Question

$$\frac{ 2 }{ x } = \frac{ 7 }{ y } = \frac{ 9 }{ z } = \frac{ 84 }{ 356 }$$

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