Răspunsuri

2014-10-07T22:37:23+03:00
5x+18+20y=43 => 5x+20y=25 
15x+60y=25x3
15x+60y=75
15x+38+60y= 113

2014-10-07T22:37:59+03:00
5(x + 4y) = 43 - 18
5(x + 4y) = 25
x + 4y = 5
15(x + 4y) + 38 = 15 * 5 + 38 = 75 + 38 = 113