Răspuns:
2x + 4· ( x-1)= 5x
2x + 4x- 4 = 5x
6x-5x=4
x=4
2+2·( 2+2 · ( x+2))= 14
2+2·( 2+ 2x + 4)= 14
2+ 2· ( 6 + 2x) = 14
2+ 12 + 4x = 14
14 - 14 = 4x
4x=0
x=o
3· (2x+1) - 5(x+2)= 3x-4
6x+3 - 5x - 10= 3x + 4
x - 7= 3x + 4
-7 - 4 = 3x - x
- 11= 2x
x= -11 : 2
5x - 4( 2x+3) = 3-2( 4- 5x)
5x -8x - 12= 3-8 + 10x
3x - 12= -5 + 10x
3x - 10x= 12-5
-7x= 7
-x= -1
x=1
7(x+1) = 3(x-2) - 4(5-x)
7x+7= 3x - 6 - 20 + 4x
7x+7= 7x - 26
7x-7x= - 26- 7
x= - 33
