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4(3a+1) - 7 + 4.2 - 7 = 12a + 4 - 7 + 8 -7
= 12a + 12 - 14
= 12a - 2
f(3a+1) = 4(3a+1) - 7
= 12a + 4 - 7
= 12a - 3
f(2) = 4(2) - 7
= 8-7
= 1
f(3a+1) + f(2) = 12a - 3 + 1 = 12a - 2
sorry kalo salah