$2\left(-3-2m\right)\left(-5+8n\right)-7$
$196\cdot196$
$-5\left(-7\right)$
$\ln\left(x-3\right)-\frac{1}{3}\ln\left(27\right)=\ln\left(4\right)$
$2x^4-4x^3+6x^2$
$\left(\sqrt{5}y^2-\sqrt{10}z^2\right)^2$
$4a^2+44a+121$
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