Z + 2 11/52 = 7 5/39 , 8 7/39 - x = 5 9/26 решите уравнения пожалуйста

Z + 2 11/52 = 7 5/39 , Z= 7 5/39 - 2 11/52Z=5 5/39-11/52Z=5 20/156- 33/156 Z=4 176/156-33/156Z=4 143/1568 7/39 - x = 5 9/26x =8 7/39 - 5 9/26x = 3  14/78 -  27/78х=2 92/78-27/78х=2 65/78