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x in (-oo:+oo)
b-(k/z) = t+x // - t+x
b-t-x-(k/z) = 0
b-t-x-(k*z^-1) = 0 // - b-t-(k*z^-1)
-x = -(b-t-(k*z^-1)) // * -1
x = b-t-(k*z^-1)
x = b-t-(k*z^-1)
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