$+845+-442$
$3452-\left(-655\right)$
$9\left(5\right)^2+12\left(-5\right)+6$
$-2\cdot\left(-3\right)^3$
$y'-4y=e^{5t}$
$\left(3x^2-4y\right)\left(3x^2+4y\right)\:\:\:\:\:$
$y'=-xe^y$
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