$3+\left(+3\right)-\left(-3\right)-\left(-6\right)$
$x^3+6x^2-x-30\le0$
$\left(2x-c\right)^2$
$3n^2-16n+20$
$16=4x$
$\frac{x}{4}+1=4$
$\lim_{t\to1}\left(\left(3t-1\right)\left(5t^2+2\right)\right)$
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