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cum se rezolva exercitiul 2(3x+1)-1=43

Răspuns :

2(3x+1)-1=43
2(3x+1)=43+1=44
3x+1=44/2=22
3x=22-1=21
x=21/3
x=7
2(3x+1)-1=43
6x+2-1=43
6x+2=43-1
6x+2=42
6x=42-2
6x=40
x=40/6