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2x-y=0
2x+7y=-16
-y=-2x |:(-1)
2x+7y=-16
y=2x
2x+7*2x=-16
y=2x
2x+14x=-16
y=2x
16x=-16 |:16
y=2x
x=-1
y=2*(-1)
x=-1
y=-2
PS to jest układ równań;))