$\left(5m-3n+4d\right)^2$
$\left(x+2\right)\left(-x-1\right)$
$\left(x^4-2x^2+1\right)\left(x^2-1\right)$
$\left(\:30\right)\left(-6\right)\:$
$1+\frac{y}{5}+\frac{y^2}{100}$
$3x^2-4^2$
$3b+b+2b$
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