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Rezolvati in N: 7-3x=1

Răspuns :

7-3x=1
3x=7-1
3x=6
x=6:3
x=2
verificare:7-3×2=7-6=1
7-3x=1
-3x=1-7
-3x=-6
x=-6:(-3)
x=2
x∈N