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x in (-oo:+oo)
b = (3*x)/h // - (3*x)/h
b-((3*x)/h) = 0
b-3*h^-1*x = 0
b-3*h^-1*x = 0 // - b
-3*h^-1*x = -b // : -3*h^-1
x = -b/(-3*h^-1)
x = (1/3)*b*h
x = (1/3)*b*h
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