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7(-2x+4y-5z)+4(3x-5y+6z)-2(5x-3y+9z) dau coronita si love


Răspuns :

-14x+28y-35z+
+12x-20y+24z-
-10x+6y-18z=
=-12x+14y-29z

-14x+28y-35z+12x-20y+24z-10x+6y-18z=
-12x +14y -29z