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3c-7+12c=89
We simplify the equation to the form, which is simple to understand
3c-7+12c=89
We move all terms containing c to the left and all other terms to the right.
+3c+12c=+89+7
We simplify left and right side of the equation.
+15c=+96
We divide both sides of the equation by 15 to get c.
c=6.4
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