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f(a) = -7
maka
3a + 5 = -7
3a = -7 - 5
3a = -12
a = -4
f(a) = 3a + 5
-7 = 3a + 5
-7 - 5 = 3a
-12 = 3a
= a
-4 = a
smg membantu... :D