$\frac{1}{2}x^4e^2x$
$4\left[8-\left(-5\right)\right]-\left(-2\right)\left(-6\right)$
$\left(2a+b\right)x+16=24x+\left(2a+b\right)$
$20x^4-72x^2+36$
$a^2b+15a^2b+a^2b-85a^2b-131a^2b+39a^2b$
$\frac{t^2+t+2}{t-1}$
$x^{2-7x+\frac{49}{4}}$
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