$\lim_{x\to3}\left(\frac{x+7}{3x^2-5x-12}\right)$
$4\left(4+25x^2\right)$
$-9b-4$
$\frac{\left(3+4i\right)\cdot\:\left(\frac{3}{2}\sqrt[3]{-64}-2i\right)}{\left(2\frac{2}{5}-4i\right)\cdot\:\frac{5}{2}}$
$25x.\left(a-b\right)+15y\left(a-b\right)$
$4t^2+15t+9$
$a^3-27b^6$
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