Task: Question Answering
Input (English): If \(10a + 8b = 4x\), then, in terms of \(x\), \(5a + 4b\) =
(A)\(8x\) (B)\(4x\) (C)\(2x\) (D)\(x\) (E)\(\frac { x } { 2 } \)
Output (English): C