Kimball’s maximum lung capacity is \(6.9\) liters. If his lungs are full and he exhales at a rate of \(0.8\) liters per second, when will he have \(4.82\) liters of air left in his lungs?

Assume \(s\) seconds later, there would be \(4.82\) liters of air left in Kimball’s lungs. Write an equation to model this scenario. There is no need to solve it.