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Anonymous
Re-ordering it : 13a - a -15b + 2b = 12a - 13b
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15b + 13c - 12b + 10c + 8 = 3b + 23c + 8
-b+5b-2b=2b
If: a = 2b+c Then: a-c = 2b And: b = (a-c)/2
8b + 11 - 3b = 2b + 2 5b + 11 = 2b + 2 5b - 2b = 2 - 11 3b = -9 b = -3