$\left(-\:3.756\right)\cdot\left(41978024\right)\:\:$
$y=4x^2-12x-\frac{7}{x^7}$
$81-100n^2$
$4y^2-9x^2-36z=0$
$30\cdot\left(-18\right)$
$6^{-4+3}$
$18x-6x^2+12=-420$
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