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y''' + 7*y'' + 8*y' + 9*y = 20*exp(-t); y(0) = 0; y'(0) = 0; y''(0) = 0
y''' + 7*y'' + 8*y' + 9*y = 20*exp(-t); y(0) = 0; y'(0) = 0; y''(0) = 0
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