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Preheat oven to 350°F.
Whisk flour, sugar, cocoa powder, baking soda, and salt in a large mixing bowl. Add water, oil, and vinegar. Mix until a smooth batter forms, about 30 seconds.
Grease a 9x13-inch cake pan. Spread batter evenly into the pan.
Bake until a cake tester inserted into the center of the cake comes out clean, about 40 minutes.
Let cake cool in the pan. When it's cool, make the frosting. (optional.)
For the Frosting: Mix the softened butter until light and fluffy. Add the powdered sugar, cocoa powder, and salt. Turn mixer on. Add milk and mix until fluffy. If frosting is thick, add a little additional milk.