b=40-4b

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Solution for b=40-4b equation: 


Simplifying
b = 40 + -4b

Solving
b = 40 + -4b

Solving for variable 'b'.

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

Add '4b' to each side of the equation.
b + 4b = 40 + -4b + 4b

Combine like terms: b + 4b = 5b
5b = 40 + -4b + 4b

Combine like terms: -4b + 4b = 0
5b = 40 + 0
5b = 40

Divide each side by '5'.
b = 8

Simplifying
b = 8

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