21=b+12

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Solution for 21=b+12 equation:


Simplifying
21 = b + 12

Reorder the terms:
21 = 12 + b

Solving
21 = 12 + b

Solving for variable 'b'.

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

Add '-1b' to each side of the equation.
21 + -1b = 12 + b + -1b

Combine like terms: b + -1b = 0
21 + -1b = 12 + 0
21 + -1b = 12

Add '-21' to each side of the equation.
21 + -21 + -1b = 12 + -21

Combine like terms: 21 + -21 = 0
0 + -1b = 12 + -21
-1b = 12 + -21

Combine like terms: 12 + -21 = -9
-1b = -9

Divide each side by '-1'.
b = 9

Simplifying
b = 9

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