$\left(a+b\right)\left(x-y-z\right)$
$2n^5+7n^4+7n^3-6n^2-4n$
$4x+3^3$
$x^2-16\:+\:x^2-25$
$\int\frac{y^4-8}{y^3+2y}dy$
$\left(35-3x\right)^2$
$x^2-6x+9\ge0$
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