$2x\:-\:7x\:-\:9x\:$
$a^3-a^2+a-1$
$\lim_{x\to\infty\:}\left(\frac{3+5^x}{4x^2+6x}\right)$
$5\cdot1\cdot21\cdot5$
$\left(x-3\right)^2\left(x-1\right)-2$
$12\cdot3+-5$
$\left(d^2+6\right)\left(d^2+1\right)$
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