A triangle has side lengths of $(5\mathrm{.}5$x$+6\mathrm{.}2$y$)$ centimeters, $(4\mathrm{.}3$x$+8\mathrm{.}3$z$)$ centimeters, and $(1\mathrm{.}6$z$-5\mathrm{.}1$y$)$ centimeters. Which expression represents the perimeter, in centimeters, of th triangle?