5.100 Решите уравнение: a) 0,7x + 4 = 0,3x; б) -0,2x - 18 = 0,7x; в) 2x - \frac{1}{3} = \frac{5}{6}x + 2;

Решение: a) 0,7x + 4 = 0,3x 0,7x - 0,3x = -4 0,4x = -4 x = -\frac{4}{0,4} x = -10 б) -0,2x - 18 = 0,7x -0,2x - 0,7x = 18 -0,9x = 18 x = -\frac{18}{0,9} x = -20 в) 2x - \frac{1}{3} = \frac{5}{6}x + 2 2x - \frac{5}{6}x = 2 + \frac{1}{3} \frac{12}{6}x - \frac{5}{6}x = \frac{6}{3} + \frac{1}{3} \frac{7}{6}x = \frac{7}{3} x = \frac{7}{3} * \frac{6}{7} x = 2