Răspuns:
Explicație pas cu pas:
a) Numitor comun 24:
12(3x-5)-6(5x+1)=2(2x+6)-4(3x-12)-24
36x-60-30x-6=4x+12-12x+48-24
14x = 102 | :2
x = 51/7
b) |2x+1| = 2x+1 pt. x > -1/2
-2x-1 pt x < -1/2
2x+1 - 5 = 12
2x = 16
x = 8
-2x-1 -5 =12
-2x = 18
x = -9