$\lim_{x\to\frac{1}{2}}\left(\frac{24x-12}{2x-1}\right)$
$10\left(d-4\right)\:and\:10d-40$
$\left(a^{x+1}\right)^2-\left(2b^{x-1}\right)^2$
$8b+8-4b-3$
$12am+54am$
$81x^2-100$
$\left(4+x\right)\frac{dy}{dx}=y^3$
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