Let x-by + CZ, y = CZ + ax, z = ax + by, find the value of a / A + 1 + B / B + 1 + C / C + 1

Let x-by + CZ, y = CZ + ax, z = ax + by, find the value of a / A + 1 + B / B + 1 + C / C + 1

x=by+cz
ax=y-cz
=>(a+1)x=(b+1)y
The same is true
(c+1)z=(b+1)y
(a+1)x=(c+1)z
The original formula = ax / (B + 1) y + by / (B + 1) y + CZ / (B + 1) y
=(ax+by+cz)/(b+1)y
=(z+cz)/(b+1)y
=1