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untuk cara terlampir di attachment
misal matriks D =
[a...b]
[c...d]
a= 2(2)+ 5 + 3 = 4+5+3 =12
b= 2(1)+6+5 = 13
c= 2(-3) -1 + 2 = -5
d= 2(4) - 3 - 7 = -2
det D = ad - bc
det D = 12(-2) - 13(-5) = - 24 +65 = 41