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2•(x+1)+1=x+15
Ajutor...


Răspuns :

2(x+1)+1=x+15

2x+2+1=x+15

2x+3=x+15

x=12

2x+2+1=x+15
2x+3=x+15
3x=15-3
3x=12
x=12:3
x=4