$-\left(2x-3y\right)^2$
$\frac{3}{4}x+5=11$
$\lim_{x\to0}\frac{x-2+\sqrt{x^2+x+25}}{x^2+2x}$
$427.18+381.23+191.59$
$\left(\frac{1}{6}\right)^{-2}$
$( - 2 x - y ) ^ { 2 }$
$\left(x+6\right)\left(x+7\right)$
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