Question

Rezolvați in Mulțimea numerelor naturale ecuația :2•(3x+1)-1=43

Answer 1

$2(3x+1)-1=43 \\ 6x+1=43 \\ 6x=42 \\ x=7$

Answer 2

2•(3x+1)-1=43 ; 2•(3x+1)=43+1 ; 3x+1=44/2 ; 3x=22-1 ; x=21/3 ; x=7 apartine N; S={7}.