If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
p = (r/2)*(t+v) // - (r/2)*(t+v)
p-((r/2)*(t+v)) = 0
p-1*1/2*r*(t+v) = 0
p-1*1/2*r*(t+v) = 0
p-1/2*r*t-1/2*r*v = 0
p-1/2*r*t-1/2*r*v = 0
x belongs to the empty set
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