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is it continous, and is f' continous
f(1)=n-1
g(1)=m+5, or m+5=n-1 or m=n-6
f'=3nx^2
f'(1)=3n
g'=2mx
g'(1)=2m
so continous means 2m=3n or 2n-12=3n
n=-12
check my work.