$45\cdot104$
$6x\:=\:78\:\:\:\:\:\:\:\:\:\:\:$
$\frac{6x^4+17x^2+7x+20}{2x^2-2x+5}$
$\frac{d}{dx}e^{x^2y}=5x+6y+7$
$\left(5x+6\right)\left(4x+2\right)$
$\lim_{x\to\infty}\left(1-\frac{5}{2x}\right)^{4x}$
$\left(3x\right)\left(x\right)\left(3y\right)$
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