\(M=\frac{x+y}{z}+\frac{x+z}{y}+\frac{y+z}{x}\\ M=\frac{x+y+z}{z}+\frac{x+y+z}{y}+\frac{x+y+z}{x}-\frac{z}{z}-\frac{y}{y}-\frac{x}{x}\\ M=\left(x+y+z\right)\left(\frac{1}{x}+\frac{1}{y}+\frac{1}{z}\right)-1-1-1\\ M=2020\cdot\frac{1}{202}-3\\ M=10-3=7\)