$\frac{12ax-14a^2}{6x-7a}$
$16,23\cdot25$
$\lim_{x\to4}\left(\frac{5x-20}{\sqrt{x}-2}\right)$
$3\left(a-5b\right)-\left\{7a-\left[3\left(a-b-2\right)+4\right]\right\}$
$6a+4-3a+90$
$4t\:x\:4t\sqrt{7}$
$\lim_{x\to-\infty}\frac{1}{4x^2+\sqrt{6}}$
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