b+8=21

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Solution for b+8=21 equation: 


Simplifying
b + 8 = 21

Reorder the terms:
8 + b = 21

Solving
8 + b = 21

Solving for variable 'b'.

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

Add '-8' to each side of the equation.
8 + -8 + b = 21 + -8

Combine like terms: 8 + -8 = 0
0 + b = 21 + -8
b = 21 + -8

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

Simplifying
b = 13

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