$10-\left(-400\right)$
$400\:+\:40x\:+\:x^2\:=\:0$
$1^{18}-9^2$
$8t^2+10t+5=0$
$5x^3y^4\left(3x^2y^2-7x^{5y}\right)$
$\lim_{x\to infty}\left(\frac{4x}{\sqrt{2x^2+1}}\right)$
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