21=9b

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Solution for 21=9b equation:


Simplifying
21 = 9b

Solving
21 = 9b

Solving for variable 'b'.

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

Add '-9b' to each side of the equation.
21 + -9b = 9b + -9b

Combine like terms: 9b + -9b = 0
21 + -9b = 0

Add '-21' to each side of the equation.
21 + -21 + -9b = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -9b = 0 + -21
-9b = 0 + -21

Combine like terms: 0 + -21 = -21
-9b = -21

Divide each side by '-9'.
b = 2.333333333

Simplifying
b = 2.333333333

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