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x in (-oo:+oo)
t_1 = -2^z
t_1+x*y^-1 = 0
t_1+x*y^-1 = 0 // - t_1
x*y^-1 = -t_1 // : y^-1
x = -t_1/(y^-1)
x = -(t_1*y)
x = -(y*(-2^z))
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