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5c+7c=72
We simplify the equation to the form, which is simple to understand
5c+7c=72
We move all terms containing c to the left and all other terms to the right.
+5c+7c=+72
We simplify left and right side of the equation.
+12c=+72
We divide both sides of the equation by 12 to get c.
c=6
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