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Subtract 3a - 2b + c from 5a + b - 4c.
Subtract 4ab - 5bc + 2ca from 7ab + 3bc - ca.
From the sum of 3a^2 - 4ab + b^2 and 2a^2 + 6ab - 3b^2, subtract 4a^2 - ab - 5b^2. Find the value of the result when a = 2 and b = -1.
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