-b+21=12

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Solution for -b+21=12 equation:


Simplifying
-1b + 21 = 12

Reorder the terms:
21 + -1b = 12

Solving
21 + -1b = 12

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 + -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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