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2*(3x+1)-1=43 ! Va rog mult! Dau corinita.

Răspuns :

2(3x+1)-1=43
2(3x+1)=44
3x+1=22
3x=21
x=21:3
x=7
2(3x+1)-1=43 ( +1)
2(3x+1)=44   ( :2)
3x+1=22    (-1)
3x=21  
x=21:3
x=7