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-#' Single First-Order Reversible Binding kinetics
-#' 
-#' Function describing the solution of the differential equations describing
-#' the kinetic model with first-order terms for a two-way transfer from a free
-#' to a bound fraction, and a first-order degradation term for the free
-#' fraction.  The initial condition is a defined amount in the free fraction
-#' and no substance in the bound fraction.
-#' 
-#' @param t Time.
-#' @param parent.0 Starting value for the response variable at time zero.
-#' @param k_12 Kinetic constant describing transfer from free to bound.
-#' @param k_21 Kinetic constant describing transfer from bound to free.
-#' @param k_1output Kinetic constant describing degradation of the free
-#'   fraction.
-#' @return The value of the response variable, which is the sum of free and
-#'   bound fractions at time \code{t}.
-#' @references FOCUS (2006) \dQuote{Guidance Document on Estimating Persistence
-#'   and Degradation Kinetics from Environmental Fate Studies on Pesticides in
-#'   EU Registration} Report of the FOCUS Work Group on Degradation Kinetics,
-#'   EC Document Reference Sanco/10058/2005 version 2.0, 434 pp,
-#'   \url{http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics}
-#' @examples
-#' 
-#'   \dontrun{plot(function(x) SFORB.solution(x, 100, 0.5, 2, 3), 0, 2)}
-#' 
-#' @export
-SFORB.solution = function(t, parent.0, k_12, k_21, k_1output) {
-  sqrt_exp = sqrt(1/4 * (k_12 + k_21 + k_1output)^2 + k_12 * k_21 - (k_12 + k_1output) * k_21)
-  b1 = 0.5 * (k_12 + k_21 + k_1output) + sqrt_exp
-  b2 = 0.5 * (k_12 + k_21 + k_1output) - sqrt_exp
-
-  parent = parent.0 *
-        (((k_12 + k_21 - b1)/(b2 - b1)) * exp(-b1 * t) +
-        ((k_12 + k_21 - b2)/(b1 - b2)) * exp(-b2 * t))
-}