2b-21=3

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Solution for 2b-21=3 equation: 


Simplifying
2b + -21 = 3

Reorder the terms:
-21 + 2b = 3

Solving
-21 + 2b = 3

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 + 2b = 3 + 21

Combine like terms: -21 + 21 = 0
0 + 2b = 3 + 21
2b = 3 + 21

Combine like terms: 3 + 21 = 24
2b = 24

Divide each side by '2'.
b = 12

Simplifying
b = 12

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