Bismuth-210 decays at a rate proportional to the amount present. A sample of Bismuth-210 that initially had a mass of 1400 mg decayed 700 mg in 5 days. Let M(t) be the mass of Bismuth-210 in milligrams t days after the initial sample of 1400 mg began to decay. Set up and solve an Initial Value Problem for determining M(t). (Express numbers in exact form. Use symbolic notation and fractions where needed.) M(t) =

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