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7(2x-y=2) 14x-7y=14
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y= 0
-7x-4y=7
-7x-4(0)=7
-7x=7
x=-1
otra
2y=7-x -1( x+2y=7)
2y=-6x-8 6x+2y=-8
-x-2y=-7
6x+2y=-8
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5x =-15
x=-3
x+2y=7
-3+2y=7
y=5