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x in (-oo:+oo)
y = w+x+z/8 // - w+x+z/8
y-w-x-(z/8) = 0
y-w-x-1/8*z = 0 // - y-w-1/8*z
-x = -(y-w-1/8*z) // * -1
x = y-w-1/8*z
x = y-w-1/8*z
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