$50\:\left|-50\right|$
$400x^22y^22-120xyz+9z$
$3\log_x\left(a\right)+\log_x\left(b\right)-2\log_x\left(c\right)$
$x^4-81\ge0$
$\left(r-\frac{1}{r}\right)^2$
$\int x^2\sqrt{x^3+18}dx$
$\frac{a}{2}=a+4$
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