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  1. If  
    x
    		 + 1 =
    x
    		 +
    a − b
    		, then x is equal to
    a + ba − ba + b
    1. 2a – b
    2. a + b
    3. a – b
    4. 2a + b
Correct Option: C

x
 + 1 =
x
 +
a − b
a + ba − ba + b

⇒ 
x
 −
a − b
 =
x
 − 1
a + ba + ba − b

⇒ 
x − a + b
 =
x − a + b
a + ba − b

⇒  (x − a + b)
1
 −
1
 = 0
a + ba − b

⇒  x − a + b = 0
⇒  x = a – b


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