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Examples showing how to solve for a variable.

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I can't remember how to solve for x. What are some problems where I have to solve for x?

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Examples are shown of how to solve for a variable.

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example 1: y=x^2+2x+3 when y=2 we get x^2+2x+3=2 ,so x^2+2*x+1=0. But x^2+2*x+1=(x+1)^2,so x=-1.

example 2: ...

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