$x^2-40x+351$
$x^4+\frac{1}{x^4}$
$-4+5-6\left(3+1\right)$
$2d+\left(f+d\right)$
$5u+8\cdot5v+3+5u+8+5v+3$
$6\left(-4+15\right)$
$n^2-5n+9$
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