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3) 5(x - 1,5) = 4(2/3)x - 8(3/14)

5x - 7,5 = (14/3)x - 115/14

5x - (14/3)x = 7,5 - 115/14

(1/3)x = -5/7

x = -15/7

4) 1(7/9)x - 1(1/9) = 4(2/9) * (1 - x)

(16/9)x - 10/9 = 38/9 - (38/9)x

(16/9)x + (38/9)x = 38/9 + 10/9

(54/9)x = 48/9

6x = 16/3

x = 8/9