Răspuns :
x · 2 / 5 = x -210
2x / 5 = x-210
2x/5 -x = -210
(2x -5x) / 5 = -210
-3x / 5 = -210
-3x = - 1050 I × (-1)
3x = 1050
x= 1050 / 3
x = 350
2x / 5 = x-210
2x/5 -x = -210
(2x -5x) / 5 = -210
-3x / 5 = -210
-3x = - 1050 I × (-1)
3x = 1050
x= 1050 / 3
x = 350