if f(x)=-5x+11 and f(n)=21 what does n equal

[math_celebrity]

if f(x)=-5x+11 and f(n)=21 what does n equal

f(n) = -5(n) + 11

Since f(n) = 21, we have:
-5(n) + 11 = 21

Using our equation solver, we get n = -2.