$\lim_{f\to-1}\left(f^2-x^2\right)$
$\frac{11}{12}-\frac{1}{6}y+\frac{5}{6}y-\frac{1}{3}$
$\frac{x^2+7x+7}{3x+3}$
$2\:x\:+\:3\:>-2\:.\left(x+3\right)$
$4x^2-24x-28$
$1,2+1,3$
$x^4-x^2-90$
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