$\log_x\left(\frac{x-4}{x^2-4}\right)$
$-7a+5c-6b+9b-2a$
$\lim_{x\to-1.5}\left(\frac{9-4x^2}{3+2x}\right)$
$4a\:;\:a=11$
$\frac{1}{x^2\left(2x+1\right)}$
$4x^2-24x+31$
$x^2+2\sqrt{7x}+7$
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