$xy+xz$
$\frac{x}{5}-2<6$
$\left(b^4\right)^4$
$\left(x-250\right)^2$
$4 x ^ { 2 } - 30 x + 56 = 0$
$2x^2-20x=18$
$\left(m^3n^2-6f\right)\left(m^3n^2-2f\right)$
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