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x in (-oo:+oo)
a = (1/2)*y*(t+v) // - (1/2)*y*(t+v)
a-((1/2)*y*(t+v)) = 0
(-1/2)*y*(t+v)+a = 0
a-1/2*y*(t+v) = 0
a-1/2*y*(t+v) = 0
a-1/2*t*y-1/2*v*y = 0
a-1/2*t*y-1/2*v*y = 0
x belongs to the empty set
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