1. x+5=7 => x=7-5 => x=2
2. 4x-11=9 => 4x=9+11 => 4x=20 => x=20:4 => x=5
3. 2x+13=5 => 2x=13+5 => 2x=18 => x=18:2 => x=9
4. Nu inteleg ce scrie
5. 4(x+5)=10 => 4x + 20 =10 => 4x = -10 => x= -10:4 => -2,5
6. 2(x-3)-3=x-2 => 2x-6-3=x-2 => 2x-9=x-2 => 2x-x=-2+9 => x=7
