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Preheat oven to 350 degrees F (175 degrees C). Grease and flour two 8x4-inch loaf pans.
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Cream the margarine and cream cheese together. Gradually add the white sugar, and continue beating until light and fluffy. Add eggs one at a time, beating well after each addition. Stir in the mashed bananas and vanilla. Add flour, baking powder, and baking soda; mix until batter is just moist.
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In a small bowl, mix together chopped pecans, 2 tablespoons brown sugar, and cinnamon.
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Divide half the batter between the two prepared loaf pans. Sprinkle pecan mixture over the batter in the pans, and top with remaining batter.
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Bake in the preheated oven until a toothpick inserted in the center of each loaf comes out clean, about 45 minutes.