151. Найдите корень уравнения: a) (13x-15) - (9 + 6x) = -3x; б) 12-(4x-18) = (36 + 4x) + (18-6x);

a) (13x - 15) - (9 + 6x) = -3x $$13x - 15 - 9 - 6x = -3x$$ $$7x - 24 = -3x$$ $$7x + 3x = 24$$ $$10x = 24$$ $$x = \frac{24}{10}$$ $$x = 2,4$$   б) 12 - (4x - 18) = (36 + 4x) + (18 - 6x) $$12 - 4x + 18 = 36 + 4x + 18 - 6x$$ $$30 - 4x = 54 - 2x$$ $$-4x + 2x = 54 - 30$$ $$-2x = 24$$ $$x = -12$$ <p><strong>Ответ: а) x = 2,4; б) x = -12.</strong></p>