$\left(18\:\cdot2100\right)\:+\:\left(24\:\cdot2000\right)$
$6x^2-16x-6$
$3\left(5\right)^2-12\left(5\right)+9$
$4x^2-20+25$
$\frac{dx}{dy}\left(y^4=\left(x+y\right)^3\right)$
$-4-\left(-14\right)+-7$
$64x^2+48x+9$
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