A discount is subtracted. Suppose something's price was $5 and there was a $1 for that day. You could calculate the price by doing $5 -$1 = $4. The discount is the reduction in price.
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The opposite of add is subtract.
You add or subtract only the numerators
By the signs: 2+2(Add) 2-2(Subtract) +=add -=subtract
Subtract.
you add