-9-12+3c=12

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Solution for -9-12+3c=12 equation: 


Simplifying
-9 + -12 + 3c = 12

Combine like terms: -9 + -12 = -21
-21 + 3c = 12

Solving
-21 + 3c = 12

Solving for variable 'c'.

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

Add '21' to each side of the equation.
-21 + 21 + 3c = 12 + 21

Combine like terms: -21 + 21 = 0
0 + 3c = 12 + 21
3c = 12 + 21

Combine like terms: 12 + 21 = 33
3c = 33

Divide each side by '3'.
c = 11

Simplifying
c = 11

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