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Question: Problem with substitution

Question:Problem with substitution

ComputerUser 535 Maple
simplify substitution
October 01 2015
0

if eval(simplify( subs(a=2,subs(b= 5,f))))) - n = 0 then

      hello := union(hello, {f})

end if:

after subs(a=2,subs(b= 5,f))) to verify , some of hello return -n

negative

why it is possible to pass the if condition statement?

if it is normal case, how to write correct if statement to ensure no -n 
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