Gathering like terms together, this can be rewritten:
9a = 180
Dividing both sides of the equation by 9:
a = 20
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From your description, I get: a + b + c = 180b - 3a c = 5a You have two equations and three unknowns, which is unsolvable.
a = 20 b = 60 c = 100
12a
13a - 6 + a = 5a + 3 + 3a 13a + a - 5a - 3a = 3 + 6 6a = 9 6a/6 = 9/6 a = 3/2
5a