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(-2c ... 4) - (4 ........... a) = (-1 .... 3) (4 .... b)
(2 ...... 0) - (b + 5 ... -6) .. (0 ... 2) (-2 ... 3)
(-2c - 4 ............. 4 - a) = (-1(4) + 3(-2) ...... -1(b) + 3(3))
(2 - (b + 5) ... 0 - (-6)) .. (0(4) + 2(-2) ........ 0(b) + 2(3))
(-2c - 4 ......... 4 - a) = (-10 ....... -b + 9)
(-b - 3 .................6 ) .. (-4 ......... ....... 6)
-2c - 4 = -10 => -2c = -6 => c = 3
-b - 3 = -4 => -b = -1 => b = 1
4 - a = -b + 9 => 4 - a = -1 + 9 => -a = 4 => a = -4
Jadi a + b + c = -4 + 1 + 3 = 0