$l-\:4\:l\:\:+\:l\:1\:l$
$x+2y-3z=9$
$15>12+x$
$\lim_{x\to-\infty}\frac{3x-1}{\sqrt{x^2}-6}$
$22+x=-26$
$-3\cdot\left(x^{-3}\right)^{-2}$
$\int6x^4\left(x^5-1\right)^{15}dx$
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