Răspunsuri

2014-11-14T10:37:22+02:00
(5x -20)x4=120
5x -20=120:4
5x -20=30
5x=30+20
5x=50

x=50:5
x=10
2014-11-14T10:42:13+02:00
20X - 80 = 120
20X = 200
20X = 200 : 20
X = 10