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f(n)= 5- 3n= 20
-3n = 20 -5
-3n = 15
n= 15/-3
n= -5
n+ 5= -5 +5
= 0
f(n) = 5 -3(n) = 20
= 5 -3n = 20
= -3n = 20 -5
= -3n = 15
= n = 15/-3
= n = -5
Maak, nilai :
n +5
= -5 +5
= 0
Itu jawabannya.