$c+2c-2a+5ac$
$4a^2-2ab-6a$
$x4x^4-6x^2+6x^2+9$
$-3d+4d-5d-2c$
$-3\left(-5\right)^2-3$
$8x^2y\:-\:24xy^2\:$
$\lim_{x\to\infty}\left(\frac{\left(x^2-25\right)}{x^2-4x-5}\right)$
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