$\frac{x^2}{x^4}$
$-3\left(-6+4x\right)+6x$
$\int\frac{3}{\left(t+3\right)^2}dt$
$-7+7+8-\left(4-4\right)$
$20-14+23-15+2$
$9.1-6$
$-4\:x\:-4$
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