6) 90 = 6; X B y-5 210 = 7; 200-y г) 9 = 15;

6) $$90:x = 6$$
$$x = 90:6$$
$$x = 15$$

B) $$\frac{210}{y-5} = 7$$
$$210 = 7 \cdot (y-5)$$ $$210 = 7y - 35$$ $$7y = 210 + 35$$ $$7y = 245$$ $$y = \frac{245}{7}$$ $$y = 35$$

г) $$\frac{200-y}{9}=15$$
$$200 - y = 15 \cdot 9$$
$$200 - y = 135$$
$$y = 200 - 135$$
$$y = 65$$

Ответ: 6) x=15; B) y=35; г) y=65