$$\frac{2}{3}-y=-7$$  

(a)  

$$\frac{8}{11}+y=\frac{13}{15}$$  

(a)  

$$y-\frac{5}{9}=\frac{21}{81}$$  

(a)  

$$\frac{31}{51}-y=\frac{21}{51}$$  

(a)  

$$y+\frac{31}{73}=1$$  

(a)  

$$\frac{2}{7}\div\frac{1}{y}=2$$  

(a)  

$$5\times y\times\frac{17}{22}=\frac{255}{484}$$  

(a)  

$$\frac{9}{13}\div y=1\frac{19}{26}$$  

(a)  

$$\frac{1}{y}\div\frac{8}{15}=\frac{75}{48}$$  

(a)  

$$y\times\frac{3}{7}=\frac{9}{42}$$  

(a)  

$$\frac{13}{15}\times y=\frac{39}{30}$$  

(a)  

Вопрос на смекалку:

$$\frac{4y}{17}=28$$  

(a)  

Вопрос на смекалку:

$$\frac{5}{7y}=\frac{15}{91}$$  

(a)  

Вопрос с усложнением:

$$\frac{5\times\left(y+3\right)}{17}=\frac{3}{2}$$  

(a)