$x-\sqrt{t}=tx$
$\left(5c-3d\right)\left(5c+3c\right)$
$9m+12\cdot9m-12$
$-2a^2-a^2$
$2a^7-9a^7+25a^7$
$y^'+5y=e^{3t}$
$5x^3x\:x$
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