$y'=-2ty+t$
$\frac{\sqrt{1}}{\frac{n}{w}}$
$81x^2-162x+21$
$\left(2x^2-2x+7\right)\left(2x^2+2x-7\right)$
$\left(-3\right).\left(-3\right).5.\left(9\right)$
$a+b\left(-b\right)$
$6+-7-\left\{-8\right\}+4-2$
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