Find the general solution to y^{(4)} - 8 y^{\prime\prime\prime} + 12 y^{\prime\prime} = 0. In your answer, use c_1, c_2, c_3 and c_4 to denote arbitrary constants and x the independent variable. Enter c_1 as "c1", c_2 as "c2", etc. Enter the solution as an equation y = ?.