Решим уравнения:
a) $$3y + 5.7 = 6.75$$
$$3y = 6.75 - 5.7$$
$$3y = 1.05$$
$$y = rac{1.05}{3}$$
$$y = 0.35$$
Ответ: y = 0.35
б) $$5x + 8x + 4.8 = 10.91$$
$$13x + 4.8 = 10.91$$
$$13x = 10.91 - 4.8$$
$$13x = 6.11$$
$$x = rac{6.11}{13}$$
$$x = 0.47$$
Ответ: x = 0.47