Răspunsuri

2014-11-09T12:08:17+02:00
5 + 4x +2= 5x -5
7 + 4x= 5x -5
7+5= 5x -4x
x= 12.
B) 5x + 15+2= 3x +9
5x+ 17= 3x + 9
5x-3x= 9- 17
2x= -8
x= -4.

2014-11-09T12:13:19+02:00
 5+2 (2x+1) = 5(x-1)  
5+4x+2=5x-5
7+4x=5x-5
7+5=5x-4x
12=x

5 (x+3 )+2= 3 (x+9) 
5x+15+2=3x+18
5x+17=3x+18
5x-3x=18-17
2x=1
x=1/2
x=0,5