exam Maths Puzzle Numerical Ability

-7x- 7=-2

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I need help!!! I am suppose to describe a strategy for factoring a polynomial and give example showing all your steps. Can someone help me on this one. Bob invested $20,000, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%?

Please help me on this