ecuatia va rog 2(2x-4)-7=5


Răspuns :

2(2x-4)=5+7
2(2x-4)=12
2x-4=12:2
2x-4=6
2x=6+4
2x=10
x=10:2
x=5
4x-8=5+7
4x-8=12
4x=12+8
4x=20
x=20:4
x=5