$+3x+5x+10x+50x$
$5x^2+19x-4=0$
$7a^2+3a^2-2a^2$
$\left(2x^2+x+1\right)^4$
$\frac{x^2+1}{x}=4$
$\frac{d^2}{dx^2}\left(5+4x^2+5y^2\right)$
$3^{16}$
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