21=-7c

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Solution for 21=-7c equation:


21=-7c

We simplify the equation to the form, which is simple to understand 
21=-7c

We move all terms containing c to the left and all other terms to the right. 
+7c=-21

We simplify left and right side of the equation. 
+7c=-21

We divide both sides of the equation by 07 to get c. 
c=-3

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