-3 6) 5-5-=5

б) $$5 \frac{1}{4}y - 5 \frac{1}{4} = 5 \frac{1}{5}$$

$$\frac{21}{4}y = \frac{26}{5} + \frac{21}{4}$$

$$\frac{21}{4}y = \frac{26 \cdot 4}{5 \cdot 4} + \frac{21 \cdot 5}{4 \cdot 5}$$

$$\frac{21}{4}y = \frac{104+105}{20}$$

$$\frac{21}{4}y = \frac{209}{20}$$

$$y = \frac{209}{20} : \frac{21}{4}$$

$$y = \frac{209}{20} \cdot \frac{4}{21}$$

$$y = \frac{209}{5 \cdot 4} \cdot \frac{4}{21}$$

$$y = \frac{209}{5 \cdot 21}$$

$$y = \frac{209}{105}$$

$$y = 1 \frac{104}{105}$$

Ответ: $$y = 1 \frac{104}{105}$$