Решите уравнения 1/3 (3x-6) -2/7 (7x-21)=9;
5,4(3y-2) - 7,2 (2y -3) = 1,2

1/3 (3x-6) -2/7 (7x-21) = 9(х-2)-(2х-2*3) = 9х-2-2х+6 = 9-х = 5х = -55,4(3y-2) - 7,2 (2y -3) = 1,216,2у-10,8-14,4у+21,6 = 1,21,8у = -9,6y = - 9,6 / 1,8 = - 16 / 3