In a subtraction formula, add the subtracted and the difference, and the result is 18.6. If the difference is 4.9, how much is the subtraction? (urgent!) And how to make the formula.

First, use "18.6-4.9 = 13.7" to calculate the number of the subtracted, because the subtracted = the subtracted - difference, so use 13.7-4.9 = 8.8. Difference equals 8.8

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