how to do this?



Hi,

I want to deduce n[v]=2*n-n[c]-2 from

n[e]=1/2*(3*n[v]+n[c])
	and
n-n[e]+n[v]=1

Another words: I want to express n[v] in terms of other variables.

But solve does't work this for me.
What function should I use?
	
-- 
Wang Yin
DA Lab, Tsinghua University,
100084
Beijing China