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x in (-oo:+oo)
(2/3)*(y-Z) = x // - x
(2/3)*(y-Z)-x = 0
2/3*(y-Z)-x = 0
2/3*(y-Z)-x = 0
2/3*y-2/3*Z-x = 0
2/3*y-2/3*Z-x = 0
2/3*y-2/3*Z-x = 0 // - 2/3*y-2/3*Z
-x = -(2/3*y-2/3*Z) // * -1
x = 2/3*y-2/3*Z
x = 2/3*y-2/3*Z
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