$$0,6 – 1,6(x – 4) = 3(7 – 0,4x)$$
$$0.6 - 1.6x + 6.4 = 21 - 1.2x$$
$$-1.6x + 1.2x = 21 - 0.6 - 6.4$$
$$-0.4x = 14$$
$$x = \frac{14}{-0.4}$$
$$x = -35$$
$$\frac{x-2}{x-7} = \frac{5}{8}$$
$$8(x - 2) = 5(x - 7)$$
$$8x - 16 = 5x - 35$$
$$8x - 5x = -35 + 16$$
$$3x = -19$$
$$x = - \frac{19}{3}$$
$$x = -6\frac{1}{3}$$
Ответ: 1) -35; 2) $$-6\frac{1}{3}$$