一道数学题:已知:3a-b/3=2a+c/5=2b+c/7,则a:b:c=_____:_____:_____PS:"/"是分数线

问题描述:

一道数学题:已知:3a-b/3=2a+c/5=2b+c/7,则a:b:c=_____:_____:_____
PS:"/"是分数线