(19 - x) + 2 3/4 = 5.5
19 - x + 11/4 = 5.5
x + 19 + 11/4 = 5.5
x + 19 = 5.5 - 11/4
x + 19 = 5.5 - 2.75
x + 19 = 2.75
-x = 2.75 - 19
-x = -16.25
x = 16.25
Ответ: x = 16.25
(19 - x) + 2 3/4 = 5.5
19 - x + 11/4 = 5.5
x + 19 + 11/4 = 5.5
x + 19 = 5.5 - 11/4
x + 19 = 5.5 - 2.75
x + 19 = 2.75
-x = 2.75 - 19
-x = -16.25
x = 16.25
Ответ: x = 16.25