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Se considera ecuatia 2x-3y=7.Daca x=3,sa se afle y

Răspuns :

2x-3y=7
x=3
2 ori 3-3y=7
6-3y=7
-3y=7-6
-3y=1
y=1supra minus 3
y= -1/3
2x-3y=7; x=3;=>6-3y=7=>-3y=1=>y=-1/3.