b=.8b+4

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Solution for b=.8b+4 equation: 


Simplifying
b = 0.8b + 4

Reorder the terms:
b = 4 + 0.8b

Solving
b = 4 + 0.8b

Solving for variable 'b'.

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

Add '-0.8b' to each side of the equation.
b + -0.8b = 4 + 0.8b + -0.8b

Combine like terms: b + -0.8b = 0.2b
0.2b = 4 + 0.8b + -0.8b

Combine like terms: 0.8b + -0.8b = 0.0
0.2b = 4 + 0.0
0.2b = 4

Divide each side by '0.2'.
b = 20

Simplifying
b = 20

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