21-9=b

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Solution for 21-9=b equation:


Simplifying
21 + -9 = b

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

Solving
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.
12 + -1b = b + -1b

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

Add '-12' to each side of the equation.
12 + -12 + -1b = 0 + -12

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

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

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

Simplifying
b = 12

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