With Preben corrections now it works as expected! I cannot thank you enough :)

@PatrickT I'm new to mapleprimes and its strange engine, so I appreciate your comments.

Funny thing about that 2D math, I thougth I used it to save time. Not only it produces various garbage on regular basis, it also introduces errors I wouldn't even think about, like that one about multiplying. I cannot click your reputation thing, but many thanks, guys! You really saved some really epic grief.

With Preben corrections now it works as expected! I cannot thank you enough :)

@PatrickT I'm new to mapleprimes and its strange engine, so I appreciate your comments.

Funny thing about that 2D math, I thougth I used it to save time. Not only it produces various garbage on regular basis, it also introduces errors I wouldn't even think about, like that one about multiplying. I cannot click your reputation thing, but many thanks, guys! You really saved some really epic grief.

As kindly pointed out by Preben Alsholm, there were few typos in the sheet I posted. Those errors appeared when I was creating this sheet from my calculations and corrected formulas still produce said "error"

Only difference is that first two equations are not solved. Here are plots of respctive left hand sides

Equations nos. 3 and 4 seem to be solved all right. I re-uploaded corrected sheet below.

test_sol_v2.mw