Answer
The equation is an identity.
Work Step by Step
Distribute through the parenthesis.
$0.3x+0.6-0.5x-1=-0.2x-0.4$
Add/Subtract like terms.
$-0.2x-0.4=-0.2x-0.4$
Add $0.2x$ and $0.4x$ to each side. Because you are left with the equal constants, any value of $x$ will satisfy the given conditions, the fore making the equation an identity.
$0=0$