12=3c-9

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Solution for 12=3c-9 equation:


Simplifying
12 = 3c + -9

Reorder the terms:
12 = -9 + 3c

Solving
12 = -9 + 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.
12 + -3c = -9 + 3c + -3c

Combine like terms: 3c + -3c = 0
12 + -3c = -9 + 0
12 + -3c = -9

Add '-12' to each side of the equation.
12 + -12 + -3c = -9 + -12

Combine like terms: 12 + -12 = 0
0 + -3c = -9 + -12
-3c = -9 + -12

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

Divide each side by '-3'.
c = 7

Simplifying
c = 7

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