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x in (-oo:+oo)
2*y-(z/4) = x // - x
2*y-x-(z/4) = 0
2*y-x-1/4*z = 0 // - 2*y-1/4*z
-x = -(2*y-1/4*z) // * -1
x = 2*y-1/4*z
x = 2*y-1/4*z
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