2014-06-29 20:53:41 +0100 received badge ● Popular Question (source) 2014-06-29 20:53:41 +0100 received badge ● Notable Question (source) 2014-06-29 20:53:41 +0100 received badge ● Famous Question (source) 2013-06-03 19:23:57 +0100 received badge ● Taxonomist 2012-06-09 23:56:41 +0100 asked a question separation of variables / parameterizing equations in sage math Hi, I've sometimes run into the situation where sage math is unable to solve a system of equations that I then rearrange and am subsequently able to solve. The question is, Is sage able to do this re-arranging itself? Example: Given a contraint eq1, and eq2 for an op amp subtractor that mixes variables together  eq1 = vout == (2*v1 - 3*v2)   eq2 = vout == (v1*(R4/(R3+R4))-(((v2-(v1*(R4/(R3+R4))))/R1)*R2))  can sage somehow rewrite this as an parameterized equation in terms of v1 and v2  eq2 = vout == v1*( (R4/(R3+R4)+((R4/(R3+R4))/R1)*R2)) + v2*((-1/R1)*R2)  Without my manual intervention? I'd like to know if sage can detect that 2 == ( (R4/(R3+R4)+((R4/(R3+R4))/R1)*R2)) and -3 == ((-1/R1)*R2) and solve those. Can it also automatically detect if an equation can be safely separated in this way along some given variables?? Thanks to anyone who tries to answer this!