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Algebraic manipulation

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Involving doing opposite operations to any equation to solve for a certain variable. Ex:


x^2 + 18 &=& 43\\\\x^2 &=& 25\\\\\boxed{x&=&5}\\

Want to learn how to tackle those tough MATHCOUNTS and AMC counting and probability problems? Check out Art of Problem Solving's Introduction to Counting & Probability by David Patrick.
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