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Find the zero of the polynomial in each of the following cases:
 
(i) \(p(x) = 2x + 1\).
 
Zero of \(p(x) = 2x + 1\) is ii
 
(ii) \(p(x) = 3x\)
 
Zero of \(p(x) = 3x\) is
 
(iii) \(p(x) = ax\), \(a \neq 0\)
 
Zero of \(p(x) = ax\), \(a \neq 0\) is

(iv) \(p(x) = cx + d\), \(c \neq 0, c, d\) are real numbers.
 
Zero of \(p(x) = cx + d\) is ii