It is a single equation of direct proportionality. It cannot be solved since that would require two linear equations.
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(a-d)/2c=b
4ac + 2ad + 2bc +bd = 2a*(2c + d) + b*(2c + d) = (2c + d)*(2a + b)
c - 5d = 2 2c + d = 4 Multiply eqn 1 by 2: 2c - 10d = 4 Subtract this from eqn 2: 0c + 11d = 0 which implies that d = 0 Then, by eqn 1, c = 2
(2a + b)(2c + d)
(2a + b)(2c + d).