2x = 3y \(⇌\) x/3=y/2\(⇌\)x/18=y/12
5y = 6z \(⇌\)y/6=z/5\(⇌\)y/12=z/10
Vậy\(\frac{x}{18}=\frac{y}{12}=\frac{z}{10}=\frac{x+y+z}{18+12+10}=-\frac{20}{40}=-\frac{1}{2}=-0,5\)
\(\frac{x}{18}=x=18.0,5=9\)
\(\frac{y}{12}=y=12.0,5=6\)
\(\frac{z}{10}=10.0,5=5\)
Vậy x = 9 ; y = 6 ; z = 5