Write a C$++$ application that will declare the following variables $($x$,$ y$,$ and z$)$ with initial values of $10\mathrm{.}0$ and will execute the following formulas. All variables are to be double$-$precision floating point numbers.

a$=3$x$+$y

b$=($x$+$y$)/7$

c$=(3$x$+$y$)/($z$+2)$