21-b=10

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Solution for 21-b=10 equation: 


Simplifying
21 + -1b = 10

Solving
21 + -1b = 10

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 = 10 + -21

Combine like terms: 21 + -21 = 0
0 + -1b = 10 + -21
-1b = 10 + -21

Combine like terms: 10 + -21 = -11
-1b = -11

Divide each side by '-1'.
b = 11

Simplifying
b = 11

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