Example

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

Question

$$+\frac{7}{9}+\frac{1}{2}; \frac{8}{14}+\frac{7}{6}; \frac{5}{6}+\frac{2}{3}$$

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