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a-4 = 1/2 (f-4)
a-4 = 1/2f - 2
a = 1/2f + 2
a + 4 = 3/4 (f + 4)
a + 4 = 3/4f + 3
a = 3/4f - 1
a = 1/2f + 2
a= 3/4f - 1 - (dikurang)
0 = -1/4f + 3
1/4f = 3 f = 12
a = 8
Fikri - andi = 12 - 8 = 4