Stop by your local library and pick up a intermediate/college algebra book and run through each chapter and do the exercises..The given examples may help to jog that memory back up. I was a tutor some semesters ago, and that was what we'd do before the students took placement tests...
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The hardest thing is to be honest with yourself, especially if that means completely redefining the world you've come to know.
Don't look too hard, I'm right in front of you.
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