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substraction in algebra
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with inputs for f and g the equation fg is wrongly calculated because strangely the +4 isn't changed into 4 in a basic substraction.
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typing f(x)g(x)=0 is OK
muchas gracias. Writing brackets indeed prevents the error.
Graphically f  g shows the line x = 1 while in the Algebra it gives x = 3/5.
The same solution in the Algebra as in the Graphics could be expected in any case.
Fixed for v659
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