$3xy^5-5xz+4xy^5$
$7-\left(-27\right)^2$
$\frac{-x^5xy^{-2}-2xy^2z^4+1}{2yz^{-2}}$
$35m^5-49m^3-7m$
$dy=7xdx$
$20w-3x+2w+9x$
$( x ^ { 2 } + a ^ { 2 } ) ( x ^ { 2 } - a ^ { 2 } )$
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