б) $$\frac{3x-8}{2} = -1$$
$$3x-8 = -2$$
$$3x = 6$$
$$x = 2$$
Ответ: x = 2
б) $$\frac{7x-3}{6} = \frac{5x+1}{2}$$
$$7x-3 = 3(5x+1)$$
$$7x-3 = 15x+3$$
$$-3 = 8x+3$$
$$-6 = 8x$$
$$x = -\frac{6}{8} = -\frac{3}{4}$$
Ответ: $$x = -\frac{3}{4}$$
г) $$\frac{x}{4} - \frac{x-3}{5} = -1$$
$$5x - 4(x-3) = -20$$
$$5x - 4x + 12 = -20$$
$$x + 12 = -20$$
$$x = -32$$
Ответ: x = -32
д) $$\frac{2x+1}{5} + \frac{3x+1}{7} = 2$$
$$7(2x+1) + 5(3x+1) = 70$$
$$14x+7 + 15x+5 = 70$$
$$29x + 12 = 70$$
$$29x = 58$$
$$x = 2$$
Ответ: x = 2
e) $$\frac{8x-3}{7} + \frac{3x+1}{10} = 2$$
$$10(8x-3) + 7(3x+1) = 140$$
$$80x - 30 + 21x + 7 = 140$$
$$101x - 23 = 140$$
$$101x = 163$$
$$x = \frac{163}{101}$$
Ответ: $$x = \frac{163}{101}$$