$x-x^2+x^2-x^4$
$\left(3yz+8\right)^2$
$x^2-5x<-54$
$-x>3$
$a^{m-3}b^2a^4b^{n+4}$
$xy-8x=1$
$\frac{7}{3}x\frac{15}{49}x\frac{6}{5}$
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