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x in (-oo:+oo)
(1/12)*(x-(4*y)-(3*z)) = 0
(1/12)*(x-4*y-3*z) = 0
1/12*(x-4*y-3*z) = 0
( 1/12 )
1/12 = 0
x belongs to the empty set
( x-4*y-3*z )
x-4*y-3*z = 0 // + -4*y-3*z
x = -(-4*y-3*z)
x = -(-4*y-3*z)
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