b-12=9

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Solution for b-12=9 equation: 


Simplifying
b + -12 = 9

Reorder the terms:
-12 + b = 9

Solving
-12 + b = 9

Solving for variable 'b'.

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

Add '12' to each side of the equation.
-12 + 12 + b = 9 + 12

Combine like terms: -12 + 12 = 0
0 + b = 9 + 12
b = 9 + 12

Combine like terms: 9 + 12 = 21
b = 21

Simplifying
b = 21

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