4c=c+21

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Solution for 4c=c+21 equation: 


Simplifying
4c = c + 21

Reorder the terms:
4c = 21 + c

Solving
4c = 21 + c

Solving for variable 'c'.

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

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

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

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

Divide each side by '3'.
c = 7

Simplifying
c = 7

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