0.9x - 1.2 = 1 - 0.4x - 3.5
0.9x - 0.4x = 1 - 3.5 + 1.2
0.5x = -1.3
x = -2.6
Therefore, the solution to the equation is x = -2.6.
0.9x - 1.2 = 1 - 0.4x - 3.5
0.9x - 0.4x = 1 - 3.5 + 1.2
0.5x = -1.3
x = -2.6
Therefore, the solution to the equation is x = -2.6.