5.123 Решите уравнение: a) -36x + 660 = -3x; б) 9z = -350 + 4z; e) $$1\frac{5}{6}x + \frac{1}{3}x = 3$$.

a) -36x + 660 = -3x
-36x + 3x = -660
-33x = -660
x = -660 / -33
x = 20

б) 9z = -350 + 4z
9z - 4z = -350
5z = -350
z = -350 / 5
z = -70

e) $$1\frac{5}{6}x + \frac{1}{3}x = 3$$
$$\frac{11}{6}x + \frac{1}{3}x = 3$$
$$\frac{11}{6}x + \frac{2}{6}x = 3$$
$$\frac{13}{6}x = 3$$
x = $$3 \cdot \frac{6}{13}$$
x = $$\frac{18}{13}$$ или $$1\frac{5}{13}$$