ta có:BCNN(2;3;5)=30
=>2x=3y=5z=\(\frac{2x}{30}=\frac{3y}{30}=\frac{5z}{30}=\frac{x}{15}=\frac{y}{10}=\frac{z}{6}=\frac{x+y-z}{15+10-6}=-\frac{33}{11}=-3\)
=>x/15=-3=>x=-45
y/10=-3=>y=-30
z/6=-3=>z=-18
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