№4 Решите уравнение. a) \(6x - x = 8,4 - 0,9\) b) \(8x - 18 = 6x - 12\) c) \(17x - 10 = 22x - 7\) d) \(-15x - 14 = -10x - 18\) e) \(19x + 20 = 29x - 19\)

Решим уравнения: a) $$6x - x = 8,4 - 0,9$$ $$5x = 7,5$$ $$x = \frac{7,5}{5}$$ $$x = 1,5$$ Ответ: x = 1.5 b) $$8x - 18 = 6x - 12$$ $$8x - 6x = 18 - 12$$ $$2x = 6$$ $$x = \frac{6}{2}$$ $$x = 3$$ Ответ: x = 3 c) $$17x - 10 = 22x - 7$$ $$17x - 22x = 10 - 7$$ $$-5x = 3$$ $$x = -\frac{3}{5}$$ $$x = -0,6$$ Ответ: x = -0.6 d) $$-15x - 14 = -10x - 18$$ $$-15x + 10x = 14 - 18$$ $$-5x = -4$$ $$x = \frac{-4}{-5}$$ $$x = 0,8$$ Ответ: x = 0.8 e) $$19x + 20 = 29x - 19$$ $$19x - 29x = -20 - 19$$ $$-10x = -39$$ $$x = \frac{-39}{-10}$$ $$x = 3,9$$ Ответ: x = 3.9