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Set oven to 325 degrees.
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Grease three 9-inch round cake pans (if desired line the bottom of the pans with parchment paper).
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In a bowl combine the buttermilk with baking soda; let stand while preparing the next steps.
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In a large bowl cream sugar with butter, oil and shortening until well combined (no sugar granules should remain).
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Add in egg yolks, almond extract and vanilla; beat until well combined.
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Add in the buttermilk mixture alternately with the flour into the creamed mixture.
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In a large glass or stainless steel mixing bowl beat egg whites until stiff peaks form.
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Fold 1/3 of the whites into the creamed batter until blended, then fold in remaining whites until no streaks remain.
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Divide the batter between the three pans.
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Bake for 25-30 minutes or until cakes test done.
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Cool in pans for 15 minutes then remove to wire racks to cool completely before frosting.