a) 3x+4=-5 |-4
3x = -9 | :3
x = -3
b) 7 -x5x = -13
-5x^2 = -20 |:-5
x^2 = 4
=> x = 2; x=-2
c) 4x-6=2x-14|+6 -2x
2x = 8 |:2
x = 4
d) |5x+1| = 4 (pt ca e modul o sa egalam cu 4 si cu -4 pt ca |x| = x; x>0 si |-x| = -x; )
5x+1 = -4 |-1
5x=-5
x = -1
5x+1 = 4 |-1
5x = 3
x = 3/5
e) scapi de paranteza inmultind
22-6x = 16 -24+9x
22-6x = -8+9x | -22 |-9x
-15x = -30 |:(-150
x = 2
f) 3x-1 >= -13 |+1
3x >= -12 |:3
x >= -4
x apartine [-4; +infinit)
g) scapi de paranteza inmultind cu 5
30 -15x <= 12-9x |+9x
30 -6x <= 12 |-30
-6x <= -18|:(-6)
x <= 3
x apartine (-infinit; 3]