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-3c-12-c=-8
We simplify the equation to the form, which is simple to understand
-3c-12-c=-8
We move all terms containing c to the left and all other terms to the right.
-3c-1c=-8+12
We simplify left and right side of the equation.
-4c=+4
We divide both sides of the equation by -4 to get c.
c=-1
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