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~2A = 4 2 ~ 3C = 3a -3
6 8 6 9
~2A - B = |4- (-1) 2- 2| = |5 0|
|6- 5 8- 6| |1 2|
~ + 3C = |5+3a -3|
| 7 11|
det |5 + 3a -3 | = 10 = 55 + 33a - (-21)
| 7 11|
10 = 55 + 21 + 33a
-66 = 33a
a = -2 (c)
maaf kurang rapi