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2017-07-28 00:48:40 +0100 commented answer collect variables buried in an expression

I gave an upvote because you showed me something new. I am also updating my question to clarify it.

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2017-07-27 18:18:33 +0100 asked a question collect variables buried in an expression

Suppose we have

var('Pmean,alpha,M,Nb,D,H,c');
sol3= [M == 1/4*(2*D*Nb*Pmean - (D*H*alpha + D*H)*c)/((alpha + 1)*c)]

How would you collect the coefficients of D*H in the second term?

Specifically, once the collection is done, how could the factored version of the expression be returned?

I know from using other computer algebra systems that it can be taken all the way to this:

M==1/4*D*(-H+(2*Nb*Pmean)/((1+alpha)*c))
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2016-10-11 04:12:25 +0100 asked a question Are notebooks automatically saved on Sage Math Cloud?

Are notebooks automatically saved on Sage Math Cloud? I have noticed that sometimes when I'm working, a red button pops up inside the green save button saying "not saved". Does this mean that when the red button isn't present that the file is automatically saved similar to OnShape or Google Docs?