Question

решите пожалуйста номер 150

Answer 1

1) -x + (-1/3 - 2/5) = 1/15
-x + (-5/15 - 6/15) = 1/15
-x - 11/15 = 1/15
-x = 12/15
x = -4/5
2) (7/9 - 8/27) - x = 2/3
(21/27 - 8/27) - x = 18/27
13/27 - x = 18/27
-x = 5/27
x = -5/27