The top of the beginning problem is a quantity and the bottom is too. Multiply the bottom quantity to the top. You do something to one side you must do to the other side. Distribute the "x" to the quantity. Subtract the "5yx" to itself to move it to the otherside. You will do this to get the two "y" variables on one side. Subtract the "3" by both sides to get the number away from the "y" variables. On the right side of your problem now, Try to find a common factor which turns out to be "y" and factor out. To get why by itself, divide the quantity "18-5x" by both sides. You should now have the inverse of the problem.
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