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I don't know how to solve a second differential equation looks like this:
dL/dt + L(t) =- L(t)+Z(t)*{const-L(t)-Q(t)}/Q(t)
dQ/dt= {(- L(t))*(- L(t)+const))}/-Q(t)
dZ/dt= {(- L(t))*(- L(t)+const))}/-Q(t)
Any help will be awesome!