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-7x-4y= -7
-8x+4y = -8
= -15x=-15
x=1
y=0
2x-y = 2 (-4)
---------------------
-7x-4y = -7
-8x+4y = -8
-------------
-15x = -15
x = 1
por lo tanto :
-7(1) - 4y = -7
-7 - 4y = -7
-4y = 0
y= 0