$49^a^4-100b^2$
$6<2-a$
$-5+\left(-5f\right)+10$
$\left(\frac{1}{5}z^4-\frac{5}{3}z^3\right)^2$
$\lim_{x\to\infty}\left(\frac{n^2-1}{n^2+n}\right)$
$-3x^2-\:3x^2-3x^2$
$-2\:-35\:+\:3\:-7\:-\:2$
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