$21c-8c$
$27a^3b-46ab^3$
$3.32pn\:-\:18pnr4$
$y^2=225$
$\left(21-x\right)^2$
$-4-2x+1$
$\frac{3ba^4\cdot4a^{-4}b^4}{3a^0b^2}$
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