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