Решаем линейное уравнение:

1) 6y + 3.7 = 38.5;

6y = 38.5 - 3.7;

6y = 34.8;

y = 34.8 : 6;

y = 5.8;

2) (2.8 + x) * 9 = 1.8;

2.58 + x = 1.8 : 9;

2.58 + x = 0.2;

x = 0.2 - 2.58;

x = -2.38.