Let \(A\), \(B\) and \(C\) be the three numbers in the row of a \(3 \times 3\) grid. Number \(B\) is 1 less than number \(A\) and Number \(C\) is 4 more than number \(A\). If the row sum is 42, then find the values of each number.
\(A\) \(=\)
\(B\) \(=\)
\(C\) \(=\)