(2b)+b-12+b-12=21

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Solution for (2b)+b-12+b-12=21 equation:


Simplifying
(2b) + b + -12 + b + -12 = 21

Reorder the terms:
-12 + -12 + (2b) + b + b = 21

Combine like terms: -12 + -12 = -24
-24 + (2b) + b + b = 21

Combine like terms: (2b) + b = 3b
-24 + 3b + b = 21

Combine like terms: 3b + b = 4b
-24 + 4b = 21

Solving
-24 + 4b = 21

Solving for variable 'b'.

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

Add '24' to each side of the equation.
-24 + 24 + 4b = 21 + 24

Combine like terms: -24 + 24 = 0
0 + 4b = 21 + 24
4b = 21 + 24

Combine like terms: 21 + 24 = 45
4b = 45

Divide each side by '4'.
b = 11.25

Simplifying
b = 11.25

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