21=9b-6b

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Solution for 21=9b-6b equation:


Simplifying
21 = 9b + -6b

Combine like terms: 9b + -6b = 3b
21 = 3b

Solving
21 = 3b

Solving for variable 'b'.

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

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

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

Add '-21' to each side of the equation.
21 + -21 + -3b = 0 + -21

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

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

Divide each side by '-3'.
b = 7

Simplifying
b = 7

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