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12-4c=3c-9
We simplify the equation to the form, which is simple to understand
12-4c=3c-9
We move all terms containing c to the left and all other terms to the right.
-4c-3c=-9-12
We simplify left and right side of the equation.
-7c=-21
We divide both sides of the equation by -7 to get c.
c=3
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