$2a^2=a+1$
$-\frac{1}{2}\cdot4-\frac{1}{2}\cdot10$
$4x+5\left(x+2\right)$
$5^3\cdot5^{-1}$
$\frac{dy}{dx}=x^2y^{-7}$
$2-4+5-+6+34$
$4\sec\left(\frac{\pi}{4}\right)^2$
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