d)4\frac{1}{2}x-3\frac{2}{5}=2\frac{1}{10}x+6\frac{1}{5};

$$4\frac{1}{2}x-3\frac{2}{5}=2\frac{1}{10}x+6\frac{1}{5};$$

$$4,5x - 3,4 = 2,1x + 6,2$$

$$4,5x - 2,1x = 6,2 + 3,4$$

$$2,4x = 9,6$$

$$x = 9,6 / 2,4$$

$$x = 4$$

Ответ: 4