3b+21=30

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Solution for 3b+21=30 equation: 


Simplifying
3b + 21 = 30

Reorder the terms:
21 + 3b = 30

Solving
21 + 3b = 30

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 + 3b = 30 + -21

Combine like terms: 21 + -21 = 0
0 + 3b = 30 + -21
3b = 30 + -21

Combine like terms: 30 + -21 = 9
3b = 9

Divide each side by '3'.
b = 3

Simplifying
b = 3

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