$\frac{2}{10}a+\frac{3}{10}b-\frac{1}{5}a+\frac{3}{5}b$
$123^2$
$tan^2\left(3t\right)sec^2\left(3t\right)$
$\frac{dy}{dx}+y+\frac{4}{8-e^x}=0$
$\frac{x^2}{x^2-36}-\frac{x+3}{x+6}$
$2\left(7^x\right)=686$
$\frac{30xy-12x^{2}y+9xy}{3x}$
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