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I have an equation (for system 1)

m[tex]\ddot{x}[/tex] -k(x

_{2}-x

_{1}) - b*[tex]\dot{x}[/tex]

_{1}= f

Since this is for system 1, when I take the laplace transform of it, do i have x

_{2}as a function of s (x

_{2}(s)) or do i treat x

_{2}as a constant?

Thanks