$\:14a\:-\:21b\:+\:35\:$
$7x\ge x+30$
$4-15-40$
$\frac{8a^4-6a^2+12a^3-18a^5}{-4a^2}$
$\left(-7x^4+7x^2+6x-8\right)\left(9x^2-9+3x^5\right)$
$5xtxt2$
$\left(v-5\right)\left(v+11\right)$
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