$\frac{2x}{x+3}-\frac{x}{x-3}=\frac{5x+2}{x+3}$
$\lim_{x\to\infty}\left(\frac{8x+4}{x}\right)$
$+4-7-9$
$x+5=3x-1$
$-4d^2+2cd-c^2-3c^2+4cd-2d^2$
$cos^2a-\sin^2a$
$\int\left(\frac{x^2+5x}{x+7}\right)dx$
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