1If \(x\) \(+\) \(y\) \(=\) \(10\), then \(x\) \(+\) \(y\) \(+\) \(z\) \(=\) \(10\) \(+\) \(z\)
 
 
2. If \(A\) \(=\) \(B\), then \(\frac{A}{2}\) \(=\) \(\frac{B}{2}\).