$-x^2-2x+3\ge0$
$2\left(x+y\right)+\left(y+x\right)=310$
$\frac{1}{2}a\frac{3}{4}a$
$\frac{3}{1}+\frac{2}{1-1}+\frac{4}{1-2}$
$3\left(m-1\right)-2x\left(m-1\right)$
$19-b=32$
$\frac{d^2}{dx^2}\left(2x^2\right)$
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