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2.251799814E15 (E's represent the number of extra 0's, so you can move the decimal 15 places to the right.).

Or just think of it like this: x + x = 2x, so with x = 2 50, then you have 2 * 2 50, which is 21 * 2 50, which is which is 2 51 (which does equal to the answer above)

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14y ago

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