b-9+4b=12

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Solution for b-9+4b=12 equation: 


Simplifying
b + -9 + 4b = 12

Reorder the terms:
-9 + b + 4b = 12

Combine like terms: b + 4b = 5b
-9 + 5b = 12

Solving
-9 + 5b = 12

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 + 5b = 12 + 9

Combine like terms: -9 + 9 = 0
0 + 5b = 12 + 9
5b = 12 + 9

Combine like terms: 12 + 9 = 21
5b = 21

Divide each side by '5'.
b = 4.2

Simplifying
b = 4.2

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