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x+3)(x-3)=5-(x+2)(x-2)

Răspuns :

(x+3)(x-3)=5-(x+2)(x-2)

x²-9=5-x²+4

x²+x²=9+5+4

2x²=18

x²=9

x=+-√9

x=+-3

S={-3;+3}