$1-x=4x+21$
$3^{2x+1}=3^x+24$
$\left(02h-1\right)^2$
$\lim_{x\to\frac{\pi}{2}}\left(5e^{\tan\left(x\right)}\right)$
$\frac{1}{1+\left(x+\frac{1}{1+x}\right)}$
$x2=x-4$
$-230-290$
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