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realizeaza in Z ecuatia | 2x -3 |=7

Răspuns :

|2x+3|=7
2x+3=7
2x=7-3=4
X=4/2
X=2
-2x+3=7
-2x=7-3
-2x=4
x=-2/4
x=-2
X aparține {2,-2}