a) 3(2x-4)=7(2-x)
6x-12=14-7x
13x=26
x=2
b) 4(2x+5)=3(x-5)
8x+20=3x-15
5x=-35
x=-7
c) aduci la numitor comun 4, 1/2 amplificat cu 2 si x cu 4
4(2x-3)=4x
8x-12=4x
4x=12
x=3
