After "x" weeks Alice and Mack will have "8+x" stars and "2+2x" stars respectively. We need such "x" that "8+x=2+2x" .
Solve the equation "8+x=2+2x"; "8+x-2-x=2+2x-2-x" , that is, "x=6" (weeks).
Answer: 6 weeks.
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