1. The problem statement, all variables and given/known data A mass M is suspended from the ceiling by a spring with spring constant k, and from the floor by a spring with spring constant 3k. Find the frequency of the mass' oscillation. 2. Relevant equations F=ma 3. The attempt at a solution F(net) = Mg + kx - 3kx = Mg - 2kx performing a variable switch z= x - Mg/2k, I simplified the equation and set it equal to F(net) = Ma. Ma = -2kz ... so therefore ω = (2k/M)^1/2 As you see, I performed a variable switch and solved the angular frequency for z. Now, how do I go about switching back to x?