0.4b-3.2+1.2b=

Solution for 0.4b-3.2+1.2b= equation:

Simplifying
0.4b + -3.2 + 1.2b = 0

Reorder the terms:
-3.2 + 0.4b + 1.2b = 0

Combine like terms: 0.4b + 1.2b = 1.6b
-3.2 + 1.6b = 0

Solving
-3.2 + 1.6b = 0

Solving for variable 'b'.

Move all terms containing b to the left, all other terms to the right.

Add '3.2' to each side of the equation.
-3.2 + 3.2 + 1.6b = 0 + 3.2

Combine like terms: -3.2 + 3.2 = 0.0
0.0 + 1.6b = 0 + 3.2
1.6b = 0 + 3.2

Combine like terms: 0 + 3.2 = 3.2
1.6b = 3.2

Divide each side by '1.6'.
b = 2

Simplifying
b = 2