-4b+21=-4b

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Solution for -4b+21=-4b equation: 


Simplifying
-4b + 21 = -4b

Reorder the terms:
21 + -4b = -4b

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

Combine like terms: -4b + 4b = 0
21 + 0 = -4b + 4b
21 = -4b + 4b

Combine like terms: -4b + 4b = 0
21 = 0

Solving
21 = 0

Couldn't find a variable to solve for.

This equation is invalid, the left and right sides are not equal, therefore there is no solution.

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