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x in (-oo:+oo)
v = w+x/z // - w+x/z
v-w-(x/z) = 0
v-w+x*(-z^-1) = 0 // - v-w
x*(-z^-1) = -(v-w) // : -z^-1
x = (-(v-w))/(-z^-1)
x = (w-v)/(-z^-1)
x = (w-v)/(-z^-1)
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