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[ b 2c -13 ] [2b-5 3c+8 -13]
a-4 = 3a
a-3a = 4
-2a = 4
a = -2
b = 2b-5
b-2b = -5
-b = -5
b = 5
2c = 3c+8
2c-3c = 8
-c = 8
c = -8
2d - 3 = 11
2d = 11+3
2d = 14
d = 14/2
d = 7
menentukan nilai A
a - 4 = 3a
a-3a = 4
-2a = 4
a = -2
menentukan nilai B
b = 2b-5
b-2b = -5
-b = -5
b = 5
menentukn nilai C
2c = 3c+8
2c-3c = 8
-c = 8
c = -8
menentukan nilai D
2d - 3 = 11
2d = 11+3
2d = 14
d = 14/2
d = 7