Решение:
a) x + 3,12 = -5,43
x = -5,43 - 3,12
x = -8,55
б) $$1 \frac{3}{14} - y = 2 \frac{7}{10}$$
$$\frac{17}{14} - y = \frac{27}{10}$$
y = \frac{17}{14} - \frac{27}{10}
y = \frac{85}{70} - \frac{189}{70}
y = -\frac{104}{70}
y = -\frac{52}{35}
y = -1 \frac{17}{35}
Ответы:
a) **x = -8,55**
б) **y = -1 \frac{17}{35}**