book Maths Puzzle Numerical Ability

I am confused with this problem A woman bought some large frames for $15 each and some small frmaes for $8 each at a closeout sale. If she bought 22 frames for $239, find how many

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a negative plus a negative = a positive? ____8______ - ______7_____
y^2-16 y^2 - y- 12

I do not understand how to factor the demoninator to find a LCD.