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a - 3a = 4
-2a = 4
a = -2
2d - 3 = 11
2d = 11 + 3
d = 14 : 2 = 7
2c = 3c + 8
2c - 3c = 8
- c = 8
c = -8
b = 2b - 5
b - 2b = - 5
-b = -5
b = 5