20 1/19 - (x - 4 17/19) = 7 18/1920 1/19 - x + 4 17/19 = 7 18/19-x = 7 18/19 - 20 1/19 + 4 17/19-x = 7 + 4 - 20 + 18/19 - 1/19 + 17/19-x = 11 + 34/19-x = 11 15/19x = - (11 15/19)x = -11 15/19x = 17
20 1/19 - (x - 4 17/19) = 7 18/19
20 1/19 - x + 4 17/19 = 7 18/19
-x = 7 18/19 - 20 1/19 + 4 17/19
-x = 7 + 4 - 20 + 18/19 - 1/19 + 17/19
-x = 11 + 34/19
-x = 11 15/19
x = - (11 15/19)
x = -11 15/19
x = 17