$\frac{90}{-5}+\frac{50}{-2}+\frac{80}{-4}-\frac{60}{2}$
$\frac{cos\left(t\right)}{tan\left(t\right)}$
$\left(a^2b-3b^2-4ab\right)\left(5ab-9a^2b-8b^2\right)$
$3x+11\le14x+8$
$\left(8a^2-b\right)\left(-2ab^2\right)$
$4\cdot\left|7+\left(-3\right)+10\right|$
$15a^5b+30a^4b^2-45a^3b^3$
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