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2x-5y=16 / *(-5)
10x+14y=2
-10x+25y=-80
39y=-78 /:39
y=-2
5x+7*(-2)=1
y=-2
5x-14=1
y=-2
5x=15 / :5
y=-2
x=5
y=-2
Tak dla jasności to * to mnożenie, a : to dzielenie. :)