4b=21-b

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Solution for 4b=21-b equation: 


Simplifying
4b = 21 + -1b

Solving
4b = 21 + -1b

Solving for variable 'b'.

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

Add 'b' to each side of the equation.
4b + b = 21 + -1b + b

Combine like terms: 4b + b = 5b
5b = 21 + -1b + b

Combine like terms: -1b + b = 0
5b = 21 + 0
5b = 21

Divide each side by '5'.
b = 4.2

Simplifying
b = 4.2

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