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f(7) = 37
jadi hasilnya 80. kalo enggak salah yaaa
= 8x - 12 - 7
= 8x - 19
f 17 = 8(17) - 19 = 117
f 7 = 8 (7) - 19 = 37
nilai f17-f7 = 117 - 37 = 80