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Rezolvati in R×R sistemul de ecuatii
{x-3y=-5
{2x+3 (y-5)=-7


Răspuns :

x-3y=-5
2x+3 (y-5)=-7

x=-5 +3y
2(-5+3y)+3y-15=-7

x=-5 +3y
-10+6y+3y-15=-7

x=-5 +3y
9y=18

y=2
x=-5+3*2=-5+6=1