21=7c

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Solution for 21=7c equation:


Simplifying
21 = 7c

Solving
21 = 7c

Solving for variable 'c'.

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

Add '-7c' to each side of the equation.
21 + -7c = 7c + -7c

Combine like terms: 7c + -7c = 0
21 + -7c = 0

Add '-21' to each side of the equation.
21 + -21 + -7c = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -7c = 0 + -21
-7c = 0 + -21

Combine like terms: 0 + -21 = -21
-7c = -21

Divide each side by '-7'.
c = 3

Simplifying
c = 3

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