$\left(2c^2h+5\right)\left(4c^4h^2-10c^2+25\right)$
$-3x^2-\:-3x^2-\:-3x^2$
$-12-13+4-15$
$abc-2a^2bc^3-ab^2$
$3\cdot1+7$
$\frac{x^6}{25}-\frac{y^4}{36}$
$45\cdot111$
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