$\left(-13\right)+7-\left(-14\right)$
$d^4+6d^2f^2+9f^4$
$3\:5^3\:-4\:6^2\:+\:3$
$-38-\left(-24\right)$
$4-7\cdot4-1$
$\lim_{x\to\infty}\left(\frac{x+1}{x}\right)^{2x}$
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