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3c - 8c + 7 = -9
We simplify the equation to the form, which is simple to understand
3c-8c+7=-9
We move all terms containing c to the left and all other terms to the right.
+3c-8c=-9-7
We simplify left and right side of the equation.
-5c=-16
We divide both sides of the equation by -5 to get c.
c=3.2
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