$20z^4-10z^4+14z^4$
$-0.36-0.37$
$3p^2q.-2pq^2.-p^3q^2$
$-7x^3ex^2$
$\frac{5x+1}{3}\le7$
$t^2\:u^2\:\:t^4\:$
$\frac{z-17}{-2}=-1$
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