3b-9=21

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Solution for 3b-9=21 equation: 


Simplifying
3b + -9 = 21

Reorder the terms:
-9 + 3b = 21

Solving
-9 + 3b = 21

Solving for variable 'b'.

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

Add '9' to each side of the equation.
-9 + 9 + 3b = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 3b = 21 + 9
3b = 21 + 9

Combine like terms: 21 + 9 = 30
3b = 30

Divide each side by '3'.
b = 10

Simplifying
b = 10

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