b+13=21

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Solution for b+13=21 equation: 


Simplifying
b + 13 = 21

Reorder the terms:
13 + b = 21

Solving
13 + b = 21

Solving for variable 'b'.

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

Add '-13' to each side of the equation.
13 + -13 + b = 21 + -13

Combine like terms: 13 + -13 = 0
0 + b = 21 + -13
b = 21 + -13

Combine like terms: 21 + -13 = 8
b = 8

Simplifying
b = 8

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