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Rezolvati in N* inecuatia:4(5x+19x-17x)<84

Răspuns :

20x + 4· 19x - 4· 17x < 84
20x + 76x - 68x < 84
28x < 84
x < 84 : 28
x < 3
x ∈ N* ⇒ x ∈ { 1 , 2}, solutiile inecuatiei