To find 10% of 82, you do 82*.1 so 8.2 is taken off the total.
So if we do 82-8.2 you get 73.8 as the sale price
Hope this helps
<h2>If you mean :</h2>
Inverse both sides
Multiply both sides by 4
Divide both sides by 3
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<h2>If u mean : </h2>
Multiply both sides by the 3
Divide both sides by 4