Due to carelessness, Xiao Mahu miscalculated 70 × ({+ 5) as 70 ×} + 5. Please help him to do the calculation. How much is the difference between his result and the correct result?

70 × ({+ 5) - (70 ×} + 5) = 70 ×} + 350-70 ×} - 5 = 345 answer: the difference between his result and the correct result is 345

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