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x in (-oo:+oo)
x/y-9 = v // - v
x/y-v-9 = 0
x*y^-1-v-9 = 0 // + -v-9
x*y^-1 = -(-v-9) // : y^-1
x = (-(-v-9))/(y^-1)
x = (v+9)/(y^-1)
x = (v+9)/(y^-1)
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