You can also use find_root:
sage: h1 = var('h1')
sage: eq = (6000*(h1/2)/(((1/12)*0.1125*(h1^3)) -
((1/12)*(0.1125-0.012)*((h1-(2*0.012))^3)))) == 8928880.28799800
sage: eq.find_root(-1.2, -0.8)
-0.96594148395195312
sage: eq.find_root(-0.8, 0.2)
0.00033054212748907948
sage: eq.find_root(.2, 1)
0.36261094182488551
--Mike
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