21=2c-7-6c

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Solution for 21=2c-7-6c equation:


Simplifying
21 = 2c + -7 + -6c

Reorder the terms:
21 = -7 + 2c + -6c

Combine like terms: 2c + -6c = -4c
21 = -7 + -4c

Solving
21 = -7 + -4c

Solving for variable 'c'.

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

Add '4c' to each side of the equation.
21 + 4c = -7 + -4c + 4c

Combine like terms: -4c + 4c = 0
21 + 4c = -7 + 0
21 + 4c = -7

Add '-21' to each side of the equation.
21 + -21 + 4c = -7 + -21

Combine like terms: 21 + -21 = 0
0 + 4c = -7 + -21
4c = -7 + -21

Combine like terms: -7 + -21 = -28
4c = -28

Divide each side by '4'.
c = -7

Simplifying
c = -7

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