$x-3<7$
$4x^244x+121$
$2x^2+5y-3xy+5=0$
$\left(2\right)^2\cdot\frac{1}{2}\cdot\frac{1}{2}$
$\lim_{x\to0}\frac{\cos\left(x+3x^2\right)-e^{-\frac{x^2}{2}}}{x^2\tan\left(x\right)}$
$-\frac{1}{2}-\frac{3}{2}$
$\left(\:5-8a\:\right)\left(\:5+8a\:\right)$
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