9=-21-3c

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Solution for 9=-21-3c equation:


Simplifying
9 = -21 + -3c

Solving
9 = -21 + -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.
9 + 3c = -21 + -3c + 3c

Combine like terms: -3c + 3c = 0
9 + 3c = -21 + 0
9 + 3c = -21

Add '-9' to each side of the equation.
9 + -9 + 3c = -21 + -9

Combine like terms: 9 + -9 = 0
0 + 3c = -21 + -9
3c = -21 + -9

Combine like terms: -21 + -9 = -30
3c = -30

Divide each side by '3'.
c = -10

Simplifying
c = -10

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