x-y does not equal 10.
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x+y does not equal 10, which can be written x+y ~= 10 or x+y != 10.
That is the commutative property of equality.
m3 + m4 ≠90
1/x + 1/y y/xy + x/xy (y+x)/xy= 10/20 10/20=1/2 1/2 is the answer.
k = x y x = k/y