b+2*b=-21

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Solution for b+2*b=-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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