-4 det 4 4 -5 det 0 4 + 6 det 0 4
-5 4 -2 4 -2 5
det a b
c d
ad -bc
-4 *(4*4- (-5*4)) -5 (0*-5 -4*(-2)) + 6(0*(-5)-(-2*4))
-4 (16 - (-20)) -5 (0+8) +6( 0-(-8))
-4(36) -40+48
-144-40+48
-136
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