$\frac{dr}{dw}+5r=3$
$25x+25y$
$\int ln\left(9x+5\right)dx$
$12+7x-2x+22$
$22ab+\left(a+b\right)=93$
$\lim_{x\to\infty}\left(\frac{1-\frac{sinx}{x}}{x^2}\right)$
$\cos\left(z\right)+\tan\left(z\right)\sin\left(z\right)$
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