Re: Setting up equations

*To*: mathgroup at smc.vnet.net*Subject*: [mg66018] Re: [mg65990] Setting up equations*From*: "Carl K. Woll" <carlw at wolfram.com>*Date*: Thu, 27 Apr 2006 02:26:05 -0400 (EDT)*References*: <200604260837.EAA02689@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Yaroslav Bulatov wrote: > I'm trying to do things of the form > Solve[5 x + 6 y + 7 z == a x + b y + c z, {a, b, c}] > > But since x,y,z are variables, what I really mean is > Solve[5==a && 6==b && 7==c], so I need to convert to this form > > If I only have one variable, the following does what I need > > LogicalExpand[a*x + b*x^2 + O[x]^3 == 2*x + 3*x^2 + O[x]^3] > > But what to do if I have several variables? In your example, you could try SolveAlways: In[1]:= SolveAlways[5 x + 6 y + 7 z == a x + b y + c z, {x, y, z}] Out[1]= {{a -> 5, b -> 6, c -> 7}} Carl Woll Wolfram Research

**References**:**Setting up equations***From:*Yaroslav Bulatov <yaroslavvb@gmail.com>