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True or false.

If an equation contains more than one radical, we square each term of the equation.

$(7-\sqrt{x})^2 = 49-x$

If $\sqrt{x^2} \not= x\text{,}$ then $\sqrt{x^2} = -x\text{.}$

If $n$ is even and $a \not= 0\text{,}$ then $a^n$ is always positive.

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