Take the 2-minute tour ×
Mathematica Stack Exchange is a question and answer site for users of Mathematica. It's 100% free, no registration required.

Basically I want to reduce something like:

Subscript[P, 4] - Subscript[P, 5] == Subscript[R, 4, 5]* Subscript[i, 4, 5]

when only one of them is known (Subscript[R, 4, 5] == 1), so that Mathematica expresses the simplified form as:

Subscript[i, 4, 5] + Subscript[P, 5] - Subscript[P, 4] == 0
share|improve this question
Have a look at Reduce. –  b.gatessucks Oct 25 '12 at 9:29
Yeah I tried that... But how can you tell it to reduce so you have constants on one side ? –  TehHO Oct 25 '12 at 9:30
Perhaps this is what you are looking for? Is is possible to have mathematica move all terms to one side of an equation? –  Michael Wijaya Oct 25 '12 at 9:34
Yeah, but I also have some expressions which equal 1, and I do not want that moved over setting everything to equal zero... Basically I want all unknown on one side. And all that's known (defined) on the other side.. –  TehHO Oct 25 '12 at 9:39
So you have a - b == c * d and your only known variable is c. Then, according to your last comment, the output should be: (a - b)/d == c. That is what you are looking for? –  István Zachar Oct 25 '12 at 9:48

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.