b=20-b

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Solution for b=20-b equation: 


Simplifying
b = 20 + -1b

Solving
b = 20 + -1b

Solving for variable 'b'.

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

Add 'b' to each side of the equation.
b + b = 20 + -1b + b

Combine like terms: b + b = 2b
2b = 20 + -1b + b

Combine like terms: -1b + b = 0
2b = 20 + 0
2b = 20

Divide each side by '2'.
b = 10

Simplifying
b = 10

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