Răspuns :
x/2=y/3/z/5=k
x/2=k=>x=2k
y/3=k=>y=3k
z/5=k=>z=5k
3x+2y-z=7
3 ori 2k+2 ori 3k-5k=7
6k+6k-5k=7
7k=7=>k=7:7=>k=1
x=2 ori 1=>x=2
y=3ori 1=>y=3
z=5 ori 1=>z=5
x/2=k=>x=2k
y/3=k=>y=3k
z/5=k=>z=5k
3x+2y-z=7
3 ori 2k+2 ori 3k-5k=7
6k+6k-5k=7
7k=7=>k=7:7=>k=1
x=2 ori 1=>x=2
y=3ori 1=>y=3
z=5 ori 1=>z=5