$\left(x-2\right)\left(x=2\right)$
$7-8+9-\left(4-5-9\right)-11$
$5x^2+20x+12=0$
$4n+4+1+3n$
$\left(3a+5b^2\right)+\left(2a^2+5b^2\right)$
$\lim_{x\to\infty}\frac{\left(y+1\right)^2}{x^2+1}$
$-7\left(7+4\right)$
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