rozwiąż równanie 12+5x=66 6x=12 50x+90=190

12 + 5x = 66 5x = 54 x = 10.8 6x = 12 x = 2 50x + 90 = 190 50x = 100 x = 2 

5x = 66 - 12  5x = 54 |:5 x = 10,8 6x = 12 |:6 x = 2 50x = 190 - 90 50x = 100 |:50 x = 2