$4x^4-324$
$\lim_{x\to4}\left(3x-12\right)^{x-4}$
$\left(9x^2-6x^3\right)^2$
$7\left(-5\right)^2+21\left(-5\right)-28$
$14x\:-\:7$
$15\left(-16+14r\right)$
$x^3+x^2-3x+2;x=2$
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