$x\:\left(x+18\right)$
$7a\:-\:b\:+\:6a\:+\:8b$
$\frac{\sqrt[3]{x}+\:1}{x^2+2x-3}$
$\lim_{x\to\infty}\left(\frac{\cos\left(x\right)-1}{e^x-x-1}\right)$
$25x+12x-31x-8x+5$
$2x-5-3x+4x+2x-5-x$
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