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 $$1\frac{5}{13}$$