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If: k+3=-3 Then: k=-3-3 k=-6
As an algebraic expression it is: k-3
It is because 3 is a factor of 9. So if 9 is a factor of some number X, then X = k*9 for the factor pair 9 and k But X = k*9 = k*(3*3) = (k*3)*3 so that X is k*3 times 3 ie it is a multiple of 3.
3 is an integer and not a fraction. However, it can be expressed in rational form as (3*k)/k where k is an integer.
3 - k