Example

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

Question

$$\frac{2}{15}X\frac{-4}{|\times15}=\frac{4}{5}X-4+(-\frac{2}{3})X-4; \frac{2}{15}=4$$

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