$28a^3-12a^2+16a^2$
$a\left(x\right)=\:4x^4\:-\:50x^3\:+\:104x^2\:-\:40x$
$f\left(x\right)=-x^3+3x^2+18x$
$\:\:5^3-4^4$
$\frac{3^7}{3^2}$
$-r+4-3s+5r-2s-1$
$\left(2x-5\right)\left(3y+1\right)$
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