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subtitusi nilai a kedalam x
f(a)= 51
3a+9= 51
3a= 51-9
3a= 42
a= 42/3
a= 14
jadi,nilai a adalah 14
f(a) = 51
3a + 9 = 51
3a = 51 - 9
3a = 42
a = 14