2b=-b+21

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Solution for 2b=-b+21 equation: 


Simplifying
2b = -1b + 21

Reorder the terms:
2b = 21 + -1b

Solving
2b = 21 + -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.
2b + b = 21 + -1b + b

Combine like terms: 2b + b = 3b
3b = 21 + -1b + b

Combine like terms: -1b + b = 0
3b = 21 + 0
3b = 21

Divide each side by '3'.
b = 7

Simplifying
b = 7

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