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(1/3)*(x-(8*y)-(4*z)) = 0
(1/3)*(x-8*y-4*z) = 0
1/3*(x-8*y-4*z) = 0
x-8*y-4*z = 0 // + -8*y-4*z
x = -(-8*y-4*z)
x = -(-8*y-4*z)
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