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misal : x = yg gemar kesenian, olahraga = 3x
jadi :
36 - (x + 3x - 8) = 4
36 - (4x - 8) = 4
36 - 4x + 8 = 4
-4x + 44 = 4
-4x = -40
x = 10
yg gemar kesenian = 10 orang
no 16)
kalo fungsi domainnya harus satu satu gak boleh dobel..
jadi opsi yg bener C