To solve the equation:

0 = 2x + 0.4x + 1.2 - 0.3 - 0.6

Combine like terms:

0 = 2.4x + 0.9

Subtract 0.9 from both sides:

-0.9 = 2.4x

Divide by 2.4 on both sides:

x = -0.375

Therefore, the solution to the equation is x = -0.375.