B=42-3B

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Solution for B=42-3B equation: 


Simplifying
B = 42 + -3B

Solving
B = 42 + -3B

Solving for variable 'B'.

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

Add '3B' to each side of the equation.
B + 3B = 42 + -3B + 3B

Combine like terms: B + 3B = 4B
4B = 42 + -3B + 3B

Combine like terms: -3B + 3B = 0
4B = 42 + 0
4B = 42

Divide each side by '4'.
B = 10.5

Simplifying
B = 10.5

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