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x in (-oo:+oo)
(1/2)*(8*y-(10*z))-(3*y)-z = 0
(1/2)*(8*y-10*z)-3*y-z = 0
1/2*(8*y-10*z)-3*y-z = 0
1/2*(8*y-10*z)-3*y-z = 0
y-5*z-z = 0
y-6*z = 0
y-6*z = 0
x belongs to the empty set
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