3b-21=12

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Solution for 3b-21=12 equation: 


Simplifying
3b + -21 = 12

Reorder the terms:
-21 + 3b = 12

Solving
-21 + 3b = 12

Solving for variable 'b'.

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

Add '21' to each side of the equation.
-21 + 21 + 3b = 12 + 21

Combine like terms: -21 + 21 = 0
0 + 3b = 12 + 21
3b = 12 + 21

Combine like terms: 12 + 21 = 33
3b = 33

Divide each side by '3'.
b = 11

Simplifying
b = 11

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