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