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po dodaniu otrzymujemy -y = -11
y=11
a więc 2x-5y=3
2x-5*11=3
2x-55=3
2x=+58
x=29
czyli
x-2y=7 /*(-2)
2x-5y=3
-2x+4y=-14
--------------------
-y=-11 /*(-1)
y=11
x-2*11=7
x-22=7
x=7+22
x=29