12=7c-9

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Solution for 12=7c-9 equation:


Simplifying
12 = 7c + -9

Reorder the terms:
12 = -9 + 7c

Solving
12 = -9 + 7c

Solving for variable 'c'.

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

Add '-7c' to each side of the equation.
12 + -7c = -9 + 7c + -7c

Combine like terms: 7c + -7c = 0
12 + -7c = -9 + 0
12 + -7c = -9

Add '-12' to each side of the equation.
12 + -12 + -7c = -9 + -12

Combine like terms: 12 + -12 = 0
0 + -7c = -9 + -12
-7c = -9 + -12

Combine like terms: -9 + -12 = -21
-7c = -21

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

Simplifying
c = 3

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