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Diketahui \\(\\displaystyle f(x) = \\begin{cases} \\dfrac{\\simplify{-{b}*x^2+{a*b-1}*x+{a}}}{\\simplify{x-{a}}}, & x\\neq \\var{a} \\\\ k , & x = \\var{a} \\end{cases}\\).
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