4/9*(2,7y-2 целых1/4x)-4,2*(5/7y-0,5x)

1) 4/9 * 27/10у = 12/10у = 1,2у                3) 42/10 * 5/7у = 42/14у = 3у

2) 4/9 * 9/4х = 1х                                      4) 42/10 * 5/10х = 42/20х = 2,1х

4/9*(2,7у - 2 1/4х) - 4,2*(5/7у - 0,5х) = 1,2у - 1х - 3у + 2,1х = 1,1х - 1,8у