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x in (-oo:+oo)
x/y-4 = v // - v
x/y-v-4 = 0
x*y^-1-v-4 = 0 // + -v-4
x*y^-1 = -(-v-4) // : y^-1
x = (-(-v-4))/(y^-1)
x = (v+4)/(y^-1)
x = (v+4)/(y^-1)
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