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9c-21=17
We simplify the equation to the form, which is simple to understand
9c-21=17
We move all terms containing c to the left and all other terms to the right.
+9c=+17+21
We simplify left and right side of the equation.
+9c=+38
We divide both sides of the equation by 9 to get c.
c=4.2222222222222
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