is simply the difference of both numbers of course, the price it was sold minus the price it was bought at.
You have a coupon for 10% off a dvd that cost 15$ if a tax of 8% is charged on the original amount what will you pay for the dvd
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5w + 9z = 2z + 3w
Move terms with w to the left - subtract 3w from both sides
2w + 9z = 2z
Subtract 9z from both sides
2w = -7z
Divide both sides by 2
w =