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May 1st, 2018, 10:25 AM  #2 
Math Team Joined: Jan 2015 From: Alabama Posts: 3,192 Thanks: 871 
Where in the world did you get those? Those are badly nonlinear equations. There is not general method for nonlinear equation and, in fact, they are typically solved by numerical approximation methods.

May 1st, 2018, 12:46 PM  #3  
Senior Member Joined: Sep 2015 From: USA Posts: 1,976 Thanks: 1026  Quote:
Keep Away! They are very dangerous to even observe much less solve!  

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diff, eqns, pls 
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