-9=-21+b

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Solution for -9=-21+b equation:


Simplifying
-9 = -21 + b

Solving
-9 = -21 + 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.
-9 + -1b = -21 + b + -1b

Combine like terms: b + -1b = 0
-9 + -1b = -21 + 0
-9 + -1b = -21

Add '9' to each side of the equation.
-9 + 9 + -1b = -21 + 9

Combine like terms: -9 + 9 = 0
0 + -1b = -21 + 9
-1b = -21 + 9

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

Divide each side by '-1'.
b = 12

Simplifying
b = 12

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