$\lim_{x\to-\infty}30x-5x$
$12x^2-84x+147$
$\int\left(12\left(x^4+4x^2+6\right)^2\left(x^3+2x\right)\right)dx$
$\left(\frac{3a^2}{9^2-1}\right)\cdot\left(\frac{a^2+6a-7}{a^2+7a}\right)$
$\int_0^{\pi}\left(6cosxsinx\right)dx$
$81x^2-4$
$7\:-3y\:\cdot\:x=-2$
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