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