$z^2m+z^2n+mz+nz$
$\left(5x^3y^5+8z^4\right)^2$
$2x+4<-1$
$\left(\frac{3x}{2}-\frac{4}{3}\right)^2$
$r\left(2r-1\right)$
$2x^2+4x-140=0$
$-3\cdot2y$
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