6.77 Найдите корень уравнения: 1) $$-2(3,1x - 1) + 3(1,2x + 1) = -14,5$$; 2) $$-5(4,2y + 1) + 4(1,4y - 2) = -20,7$$.

1) $$-2(3,1x - 1) + 3(1,2x + 1) = -14,5$$ $$-6,2x + 2 + 3,6x + 3 = -14,5$$ $$-2,6x + 5 = -14,5$$ $$-2,6x = -14,5 - 5$$ $$-2,6x = -19,5$$ $$x = \frac{-19,5}{-2,6}$$ $$x = 7,5$$ 2) $$-5(4,2y + 1) + 4(1,4y - 2) = -20,7$$ $$-21y - 5 + 5,6y - 8 = -20,7$$ $$-15,4y - 13 = -20,7$$ $$-15,4y = -20,7 + 13$$ $$-15,4y = -7,7$$ $$y = \frac{-7,7}{-15,4}$$ $$y = 0,5$$ **Ответ: 1) $$x = 7,5$$; 2) $$y = 0,5$$**