$7a-5a$
$\frac{2}{x^2-9}-\frac{7x^2}{x-3}+3$
$\lim_{x\to-7}\left(\frac{4x^4+5x^3+5x+6}{x+1}\right)$
$\int_0^kx\left(x^2-16\right)dx$
$\frac{5x^5-8x^3}{3x+9}$
$\int\frac{16}{9+25r^2}dr$
$\frac{x+3}{\left(4\cdot x^2\right)+8}$
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