B=21-5B

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Solution for B=21-5B equation: 


Simplifying
B = 21 + -5B

Solving
B = 21 + -5B

Solving for variable 'B'.

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

Add '5B' to each side of the equation.
B + 5B = 21 + -5B + 5B

Combine like terms: B + 5B = 6B
6B = 21 + -5B + 5B

Combine like terms: -5B + 5B = 0
6B = 21 + 0
6B = 21

Divide each side by '6'.
B = 3.5

Simplifying
B = 3.5

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