$\frac{\left(x^4\right)}{y^4}-w^4$
$x^2-4=28$
$-2y^3\left(3xy+11y^3\right)$
$\csc^2x+4\csc x-12=0$
$14m-4m^3-2m^5$
$60+71-t^2$
$7x-11y;\:x=5;\:y=7$
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