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The restrictions are the values tha tmake the denomenators 0
if I understnad correctly, we have
which simplifies to 
denomenator is x(x+9)
set to zero to find restrictions
x(x+9)=0
set to zero
x=0
x+9=0
x=-9
restrictions are x≠0 or -9
if I understnad correctly, we have
denomenator is x(x+9)
set to zero to find restrictions
x(x+9)=0
set to zero
x=0
x+9=0
x=-9
restrictions are x≠0 or -9