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| Thanks, Michael. That works in mathematica online! In[1]:=Solve[{x+y==25,y==4x},{x},{y}] Out[1]={{x->5}} Curiously, when I do this in 11.2, I get: Solve::ivar: 2 x is not a valid variable. Solve[{3 x == 25, 2 x == 4 x},... |