For simultaneous equations in variables \(x\) and \(y\), if \(D_x = -42\) and \(D = -3\), then find the value of \(x\).
Q.1 (B)(ii) For simultaneous equations in variables \(x\) and \(y\), if \(D_x = -42\) and \(D = -3\), then find the value of \(x\).