21+c=7+3c

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Solution for 21+c=7+3c equation:


Simplifying
21 + c = 7 + 3c

Solving
21 + c = 7 + 3c

Solving for variable 'c'.

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

Add '-3c' to each side of the equation.
21 + c + -3c = 7 + 3c + -3c

Combine like terms: c + -3c = -2c
21 + -2c = 7 + 3c + -3c

Combine like terms: 3c + -3c = 0
21 + -2c = 7 + 0
21 + -2c = 7

Add '-21' to each side of the equation.
21 + -21 + -2c = 7 + -21

Combine like terms: 21 + -21 = 0
0 + -2c = 7 + -21
-2c = 7 + -21

Combine like terms: 7 + -21 = -14
-2c = -14

Divide each side by '-2'.
c = 7

Simplifying
c = 7

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