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-9c-12-3c=12
We simplify the equation to the form, which is simple to understand
-9c-12-3c=12
We move all terms containing c to the left and all other terms to the right.
-9c-3c=+12+12
We simplify left and right side of the equation.
-12c=+24
We divide both sides of the equation by -12 to get c.
c=-2
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