A tank with a capacity of 700 gal originally contains 100 gal of water with 100 lb of salt in solution. Water containing 2 lb of salt per gallon is entering at a rate of 4 gal/min, and the mixture is allowed to flow out of the tank at a rate of 6 gal/min. Let Q(t) be the amount of salt (in pounds) inside the tank at time >0. ONLY SET UP the initial value problem that Q(t) needs to satisfy. You don't need to solve this problem.

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