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Group 5c-2c and 7d-3d and it comes to 3c+4d
(a + b)(b - 2c)
4ac + 2ad + 2bc +bd = 2a*(2c + d) + b*(2c + d) = (2c + d)*(2a + b)
-60 - 17 + (4-1)d + (10-2)c = -77 + 3d + 8c.
4c+1-5+2c = 6c-4.