b-8+2b=21

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Solution for b-8+2b=21 equation:


Simplifying
b + -8 + 2b = 21

Reorder the terms:
-8 + b + 2b = 21

Combine like terms: b + 2b = 3b
-8 + 3b = 21

Solving
-8 + 3b = 21

Solving for variable 'b'.

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

Add '8' to each side of the equation.
-8 + 8 + 3b = 21 + 8

Combine like terms: -8 + 8 = 0
0 + 3b = 21 + 8
3b = 21 + 8

Combine like terms: 21 + 8 = 29
3b = 29

Divide each side by '3'.
b = 9.666666667

Simplifying
b = 9.666666667

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