№4 Решите уравнение. a) \(6x-x=8,4-0,9\) б) \(8x-18=6x-12\) в) \(17x-10 = 22x - 7\) г) \(-15x-14 = -10x-18\) д) \(19x + 20 = 29x-19\)

Решим каждое уравнение пошагово: a) $$6x - x = 8,4 - 0,9$$ $$5x = 7,5$$ $$x = \frac{7,5}{5}$$ $$x = 1,5$$ б) $$8x - 18 = 6x - 12$$ $$8x - 6x = -12 + 18$$ $$2x = 6$$ $$x = \frac{6}{2}$$ $$x = 3$$ в) $$17x - 10 = 22x - 7$$ $$17x - 22x = -7 + 10$$ $$-5x = 3$$ $$x = \frac{3}{-5}$$ $$x = -0,6$$ г) $$-15x - 14 = -10x - 18$$ $$-15x + 10x = -18 + 14$$ $$-5x = -4$$ $$x = \frac{-4}{-5}$$ $$x = 0,8$$ д) $$19x + 20 = 29x - 19$$ $$19x - 29x = -19 - 20$$ $$-10x = -39$$ $$x = \frac{-39}{-10}$$ $$x = 3,9$$ Ответ: a) x = 1,5; б) x = 3; в) x = -0,6; г) x = 0,8; д) x = 3,9