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x+2=5
y=5-x
wtedy:
x=5-2
y=5-x
x=3
y=5-3
x=3
y=2
drugi ukaład:
x=-1+y
-1=2y-1
wtedy:
x=-1+y
2y=-1+1
x=-1+y
2y=0 |:2
x=-1+y
y+o
x=-1+0
y=0
x=-1
y=0