cum rezolv acest exercitiu : 3(x+1)+7 ; si 2(x+1)=18

Răspuns :

2 (x+1)=18
2x+2=18
2x=18-2
2x=16
x=16:2
x=8
3 (x+1)+7=3x+3+7=3x+10
3x + 3 + 7 = 3x + 10

2x + 2 = 18
2x = 16
 x= 8