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f(3a+1)= 4(3a+1)-7
= 12a-3
f(2)=4.2-7
= 1
f(3a+1)+f(2)=12a-3+1
= 12a-2
maap klo salah,,
f( 3a + 1 ) = 4 ( 3a + 1 ) -7
= 12a + 4 - 7
= 12a - 3
f ( 2 ) = 4x-7
= 4 ( 2) - 7
= 8 - 7
= 1
= f ( 3a + 1 ) + f ( 2 )
= 12a - 3 + 1
= 12a -2
jawaban ( A )