4b=b+21

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Solution for 4b=b+21 equation: 


Simplifying
4b = b + 21

Reorder the terms:
4b = 21 + b

Solving
4b = 21 + 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.
4b + -1b = 21 + b + -1b

Combine like terms: 4b + -1b = 3b
3b = 21 + b + -1b

Combine like terms: b + -1b = 0
3b = 21 + 0
3b = 21

Divide each side by '3'.
b = 7

Simplifying
b = 7

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