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rezolvati in multimea numerelor naturale ecuatia: 2 ori (3x+1) -1=43

Răspuns :

2 * (3x+1) -1=43
2 * (3x+1) =43+1
2 * (3x+1) =44

3x+1=44:2

3x+1=22

3x=22-1

3x=21

x=21:3

x=7
rezolvare:
6x+2-1=43
6x+1=43
6x=43-1
6x=42
x=7