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7x - бу = 19
h)
x - 2y = 5​


Răspuns :

Răspuns:

7x=19+6y

x=5+2y

7.5+2y=19+6yy=4

35+2y=19+6y

35-19=6y-2y

16=4y

y=16:4=4

y=4

x=5+2.4

x=5+8=13

x=13