1/(a+b+x) = 1/a+1/b+1|/x where a+b≠0, ||| 1 by a + b + x is equal to to 1 by a plus 1 by B Plus 1 by X where II a + b is equal not to zero

 1/(a+b+x)=1/a+1/b+1|/x where a+b≠0,

Solution→Answer is....x= -a,x= -b





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