👤

Rezolvarea (3x-1)•20=280

Răspuns :

(3x-1)·20=280
3x·20-1·20=280
60x-20=280
60x=280+20
60x=300 /:60
x=5
3x • 20 - 1 •20 = 280
60x - 20 = 280
60x = 280 + 20
60x = 300
x = 300 ÷ 60
x = 5