2b-21=6-b

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Solution for 2b-21=6-b equation:


Simplifying
2b + -21 = 6 + -1b

Reorder the terms:
-21 + 2b = 6 + -1b

Solving
-21 + 2b = 6 + -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.
-21 + 2b + b = 6 + -1b + b

Combine like terms: 2b + b = 3b
-21 + 3b = 6 + -1b + b

Combine like terms: -1b + b = 0
-21 + 3b = 6 + 0
-21 + 3b = 6

Add '21' to each side of the equation.
-21 + 21 + 3b = 6 + 21

Combine like terms: -21 + 21 = 0
0 + 3b = 6 + 21
3b = 6 + 21

Combine like terms: 6 + 21 = 27
3b = 27

Divide each side by '3'.
b = 9

Simplifying
b = 9

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