Chapter 2 - Solving Equations - 2-5 Literal Equations and Formulas - Practice and Problem-Solving Exercises - Page 114: 48

x=-y-z+1 y=-x-z+1 z=-x-y+1

Making up our own equation, with 3 variables, I choose x+y+z=1 Now to solve for x, all we do is subtract y and z from both sides. This gives x=-y-z+1. Doing the same for y and z, we get y=-x-z+1 and z=-x-y+1.