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83-c=c+21
We simplify the equation to the form, which is simple to understand
83-c=c+21
We move all terms containing c to the left and all other terms to the right.
-1c-1c=+21-83
We simplify left and right side of the equation.
-2c=-62
We divide both sides of the equation by -2 to get c.
c=31
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