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f(a) = 1/2 (3a+2)
-14 = (3a/2)+ (2/2)
-14 = (3a/2) + 1
-14 -1= 3a/2
-15= 3a/2
-15 . 2 = 3a
-30 = 3a
-30/3 = a
jadi a = -10