Evaluate the following conditions and state true or false
 
i) 42\(+\)(16 \(+\) 26) \(=\) (42 \(+\) 16)\(+\)26
 
ii) 7\(-\)(16\(-\)26) \(=\) (7\(-\)16)\(-\)26 
 
iii) 42 \(+\) (\(-\) 42) \(= 0\)
 
iv) 7 \(+ 0 = 0\)