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a)
5-x=3
x=2
1-y=5
y=-4
K=(2, -4)
b)
7-x=5
x=2
2-y=0
y=2
K=(2, 2)
c)
1-x=-2
x=3
1-y=3
y=-2
K=(3,-2)
d)
5-x=0
x=5
-2-y=3
y=-5
K=(5, -5)