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x-y=40
x=216-y
216-y-y=40
x=216-y
-2y=-176
x=216-y
y=88
x=216-88
y=88
x=128
y=88
x+y=216
x-y=40/:-x
2y=176(216-40)/2y
y=88
x=216-88=128
spr.:128+88=216
128-88=40