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Rezolvati in multimea numerelor naturale ecuatia:
2 x {12 + 3 x [60 - 3 x (27 - 4 x 3)]} - 5x = 7


Răspuns :

2 x { 12+3 x[60-3 x(27-12)]}- 5x=7
2 x [ 12+3 x(60-3 x 15)]-5x=7
2 x [12+3 x(60-45)]-5x=7
2 x (12+3 x 15)-5x=7
2 x (12+45)-5x=7
2 x 57 -5x =7
114- 5x=7
-5x=7-114
-5x=-107