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rezolvati n^* inecuatia 4 (5x plus 19x -17x )mai mic decat 84

Răspuns :

4(5x+19x-17x)=4ori7x=28x»»x=0,1,2
4×7x<84
7x <84:4
7x <21
x <21:7
x <3
x=(0,1,2)