令x/3=y/4=z/5=k
则：x=3k,y=4k,z=5k
代入x-2y+3z=30得：
3k-8k+15k=30
10k=30
k=3
则：x=9,y=12,z=15
解方程组:x/3=y/4=z/5,x-2y+3z=30
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