$x\:+\:-7\:=\:18$
$\int\frac{\sqrt[5]{t\:\:}+\sqrt[3]{t}}{\sqrt{t}}dt$
$-7ab+3b-5ab-7b$
$\lim_{x\to\infty}\left(\frac{x+1}{x^2+4x+3}\right)$
$\left(ax+3by\right)^2$
$\sec\left(x\right)=-\frac{7}{5}$
$3x^3+3x^2+2x-8$
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