Example

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

Question

$$\frac{ 0.28 }{ 0.84 } + \frac{ 0.23 }{ 0.03 } - \frac{ 0.9 }{ 0.05 }$$

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