设x/3=y/4=z/5=k
则x=3k,y=4k,z=5k
所以3k-8k+15k=30
k=3
所以x=3X3=9,y=4X3=12,z=5X3=15
解方程组：｛x/3=y/4=z/5,｛x-2y+3z=30
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