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)
Q = (r/2)*(s+t) // - (r/2)*(s+t)
Q-((r/2)*(s+t)) = 0
Q-1*1/2*r*(s+t) = 0
Q-1*1/2*r*(s+t) = 0
Q-1/2*r*s-1/2*r*t = 0
Q-1/2*r*s-1/2*r*t = 0
x belongs to the empty set
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