5c-b=21

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Solution for 5c-b=21 equation: 


Simplifying
5c + -1b = 21

Reorder the terms:
-1b + 5c = 21

Solving
-1b + 5c = 21

Solving for variable 'b'.

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

Add '-5c' to each side of the equation.
-1b + 5c + -5c = 21 + -5c

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

Divide each side by '-1'.
b = -21 + 5c

Simplifying
b = -21 + 5c

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