Question

rezolvati in multimea nr nat ecuatia 2*(3x+1)-1=43

Answer 1

2( 3x + 1)  = 43 + 1 
2(3x +1) = 44  impartim cu 2 
3x + 1 = 22 
3x = 22 -1 
3x =  21 
x = 7 ∈ N 

Answer 2

6x+2-1=43
6x+1=43
6x=43-1
6x=42
x=42:6
x=7
S={7}