Evaluate the value of \(x\) and \(MZ\) from the following triangle \(XYZ\) if \(XM\) is the altitude from the vertex \(X\) to the base \(YZ\) and \(∠XMZ = (x +\) 21\()°\) with \(MZ = 2x\) yards.
The value of \(x\) is°.
The length of the \(MZ\) is yards.