Решение уравнений:

1. A) 18x - 35 = 5x + 21 $$ 18x - 5x = 21 + 35 $$ $$ 13x = 56 $$ $$ x = \frac{56}{13} $$

   Ответ: $$x = \frac{56}{13}$$

2. Б) 3(2x - 7) + 15 = 4x - 8 $$ 6x - 21 + 15 = 4x - 8 $$ $$ 6x - 6 = 4x - 8 $$ $$ 6x - 4x = -8 + 6 $$ $$ 2x = -2 $$ $$ x = -1 $$

   Ответ: $$x = -1$$

3. B) 5(4 - x) - 2(x + 3) = 11 $$ 20 - 5x - 2x - 6 = 11 $$ $$ 14 - 7x = 11 $$ $$ -7x = 11 - 14 $$ $$ -7x = -3 $$ $$ x = \frac{3}{7} $$

   Ответ: $$x = \frac{3}{7}$$

4. Г) 10x - (2x - 4) = 4(3x - 2) $$ 10x - 2x + 4 = 12x - 8 $$ $$ 8x + 4 = 12x - 8 $$ $$ 12 = 4x $$ $$ x = 3 $$

   Ответ: $$x = 3$$

5. Д) 5(x - 1) - 3(x + 2) = -5x $$ 5x - 5 - 3x - 6 = -5x $$ $$ 2x - 11 = -5x $$ $$ 7x = 11 $$ $$ x = \frac{11}{7} $$

   Ответ: $$x = \frac{11}{7}$$

6. E) 4x + 6 - 3(x + 1) = 5 - 2(x - 3) $$ 4x + 6 - 3x - 3 = 5 - 2x + 6 $$ $$ x + 3 = 11 - 2x $$ $$ 3x = 8 $$ $$ x = \frac{8}{3} $$

   Ответ: $$x = \frac{8}{3}$$