b+2b=21

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Solution for b+2b=21 equation: 


Simplifying
b + 2b = 21

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

Solving
3b = 21

Solving for variable 'b'.

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

Divide each side by '3'.
b = 7

Simplifying
b = 7

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