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Anonymous
180 degrees in the plane perpendicular to the xy plane.
In general, no rotation in the (x, y) plane will take it to (-x, y) unless x = y (or -y) and, in that case it is a 270 degree clockwise rotation.
Wiki User
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xy + xy = 2xy
xy/-3
(-5xy):(-xy)=
xy = 50
That is the commutative property of equality.