Example

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

Question

$$\tan\ 20+\frac{3}{13}.; \frac{5}{10}; \frac{5}{12}; \frac{12}{13}; \frac{13}{12}$$

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