9+6b-12=21

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Solution for 9+6b-12=21 equation: 


Simplifying
9 + 6b + -12 = 21

Reorder the terms:
9 + -12 + 6b = 21

Combine like terms: 9 + -12 = -3
-3 + 6b = 21

Solving
-3 + 6b = 21

Solving for variable 'b'.

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

Add '3' to each side of the equation.
-3 + 3 + 6b = 21 + 3

Combine like terms: -3 + 3 = 0
0 + 6b = 21 + 3
6b = 21 + 3

Combine like terms: 21 + 3 = 24
6b = 24

Divide each side by '6'.
b = 4

Simplifying
b = 4

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