$-4x+x-\left(-3\right)$
$1-20+1-\frac{198}{1}$
$-198+-276$
$n+n+n+12<23$
$3\left(x^2-4\right)+4x+x^3$
$\left(2x+3x^2\right)+\left(3x+x^2\right)$
$4-8-4+15$
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