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c+21+5c=0
We simplify the equation to the form, which is simple to understand
c+21+5c=0
We move all terms containing c to the left and all other terms to the right.
+1c+5c=0-21
We simplify left and right side of the equation.
+6c=-21
We divide both sides of the equation by 6 to get c.
c=-3.5
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