21=2b

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Solution for 21=2b equation:


Simplifying
21 = 2b

Solving
21 = 2b

Solving for variable 'b'.

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

Add '-2b' to each side of the equation.
21 + -2b = 2b + -2b

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

Add '-21' to each side of the equation.
21 + -21 + -2b = 0 + -21

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

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

Divide each side by '-2'.
b = 10.5

Simplifying
b = 10.5

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