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But then where did the energy come from that is present WITHIN the universe?
The best analogy that I know of is addition.
We all know that 0=0. However, 1-1=0 as well, as does 2-2, 3-3, and 1000000000-1000000000. The yin and yang of the universe is energy and gravity. Current theories state that gravity is actually negative energy. Therefore, the net energy of the universe may actually be zero.