$18x+11x$
$79+153.6$
$2x\:+\:3\:\le-4$
$1a^2-9n^2-6an$
$y^4-4y+3$
$\frac{2x^2+x-6}{x+y}$
$\int\frac{3}{2x\sqrt{9x^2-1}}dx$
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