$-703-482$
$-18x+8=-x^2$
$8\:-\:12\:-\left(6\:+\:4\right)$
$36x^2+48x-16$
$\lim_{x\to0}\left(\frac{sin21x}{x^2}\right)$
$85x\left(-2\right)$
$3x^2-8x-8=0$
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