6-9b=-21

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Solution for 6-9b=-21 equation: 


Simplifying
6 + -9b = -21

Solving
6 + -9b = -21

Solving for variable 'b'.

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

Add '-6' to each side of the equation.
6 + -6 + -9b = -21 + -6

Combine like terms: 6 + -6 = 0
0 + -9b = -21 + -6
-9b = -21 + -6

Combine like terms: -21 + -6 = -27
-9b = -27

Divide each side by '-9'.
b = 3

Simplifying
b = 3

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