9-c=-12-9

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


Simplifying
9 + -1c = -12 + -9

Combine like terms: -12 + -9 = -21
9 + -1c = -21

Solving
9 + -1c = -21

Solving for variable 'c'.

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

Add '-9' to each side of the equation.
9 + -9 + -1c = -21 + -9

Combine like terms: 9 + -9 = 0
0 + -1c = -21 + -9
-1c = -21 + -9

Combine like terms: -21 + -9 = -30
-1c = -30

Divide each side by '-1'.
c = 30

Simplifying
c = 30

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