( х -29 ) + 18 / 31 = 1 17 / 31

(х - 29) + 18/31 = 1 17/31х - 29 = 1 17/31 - 18/31х - 29 = 48/31 - 18/31х - 29 = 30/31х = 30/31 + 29х = 30/31 + 899/31х = 929/31 = 29 30/31х = 29 30/31