Răspunsuri

2014-10-07T22:26:27+03:00
7x+5 (x+3)-10x- x=20 7x+5x+15-9x=20 4x=20-15 4x=5 x=5/4.
2014-10-07T22:44:02+03:00
Desfaci paranteza 7x+5x+15-10x-x=20
7x+5x-10x-x=20-15 
1x=5
x=5