$c^2-14+49$
$\left(7a-3x^2\right)\left(7a+3x^2\right)$
$-5\left(2\left(5x^2-5x-1\right)\right)^2+5\left(5x^2-5x-1\right)+2\left(2x-1\right)$
$\left(3m-2n\right)^2\left(3m+2n\right)$
$3-7\cdot\left(-2\right)\cdot4$
$\:2x+1<3$
$\sqrt[7]{1\:}$
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