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x in (-oo:+oo)
(2*(v-h))/k = r // - r
(2*(v-h))/k-r = 0
(2*(v-h))/k+(k*(-r))/k = 0
2*(v-h)+k*(-r) = 0
2*v-2*h-(k*r) = 0
(2*v-2*h-(k*r))/k = 0
(2*v-2*h-(k*r))/k = 0 // * k
2*v-2*h-(k*r) = 0
x belongs to the empty set
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