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2a - 5 = 13
2a = 13 + 5
2a = 18
a = 18/2
a = 9
f (a)= 13
nilai a :
f(a)= 2a - 5= 13
2a= 13 + 5
2a= 18
a= 18/2
a= 9
Jadi, nila a adalah 9.