$\lim_{x\to\infty}\frac{7x-1}{7x+4}^{x+3}$
$5+20:2$
$\left(\frac{-6}{-6}\right)^8$
$36y^2-108y+81$
$9x^2-12x+36$
$2x^2+8x+1=0$
$2+2i\cdot2+2$
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