0.2(b-12)=0.4b

Solution for 0.2(b-12)=0.4b equation:

Simplifying
0.2(b + -12) = 0.4b

Reorder the terms:
0.2(-12 + b) = 0.4b
(-12 * 0.2 + b * 0.2) = 0.4b
(-2.4 + 0.2b) = 0.4b

Solving
-2.4 + 0.2b = 0.4b

Solving for variable 'b'.

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

Add '-0.4b' to each side of the equation.
-2.4 + 0.2b + -0.4b = 0.4b + -0.4b

Combine like terms: 0.2b + -0.4b = -0.2b
-2.4 + -0.2b = 0.4b + -0.4b

Combine like terms: 0.4b + -0.4b = 0.0
-2.4 + -0.2b = 0.0

Add '2.4' to each side of the equation.
-2.4 + 2.4 + -0.2b = 0.0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -0.2b = 0.0 + 2.4
-0.2b = 0.0 + 2.4

Combine like terms: 0.0 + 2.4 = 2.4
-0.2b = 2.4

Divide each side by '-0.2'.
b = -12

Simplifying
b = -12