+0  
 
+1
114
2
avatar+24 

null

 Mar 21, 2020
edited by booksly002  Apr 15, 2020
 #1
avatar+25986 
+2

Maybe by 'guestimation'   q+r = u     r+s = w    s+q = t   s-r=v

 Mar 21, 2020
 #2
avatar+24 
+1

null

booksly002  Mar 22, 2020
edited by booksly002  Apr 15, 2020

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