Пошаговое объяснение:

4 - 4,5у = 2у - 2/3(8у - 10)

4 - 4,5у = 2у - 16/3у + 20/3

4 - 4 5/10у = 2у - 5 1/3у + 6 2/3

4 - 4 1/2у = -3 1/3у + 6 2/3

-4 1/2у + 3 1/3у = 6 2/3 - 4

-4 3/6у + 3 2/6у = 2 2/3

-1 1/6у = 2 2/3

-7/6у = 8/3

у = 8/3 : (-7/6)

у = 8/3 * (-6/7)

у = 8/1 * (-2/7)

у = -16/7

у = -2 2/7

3 - 1/3(2/3у + 1/2) = 1/3у + 1,5

3 - 2/9у + 1/6 = 1/3у + 1 1/2

3 1/6 - 2/9у = 1/3у + 1 1/2

-2/9у - 1/3у = 1 1/2 - 3 1/6

-2/9у - 3/9у = 1 3/6 - 2 7/6

-5/9у = -1 4/6

-5/9у = -10/6

у = -10/6 : (-5/9)

у = -10/6 * (-9/5)

у = -2/2 * (-3/1)

у = 6/3

у = 2