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12+c-2=21
We simplify the equation to the form, which is simple to understand
12+c-2=21
We move all terms containing c to the left and all other terms to the right.
+1c=+21-12+2
We simplify left and right side of the equation.
+1c=+11
We divide both sides of the equation by 1 to get c.
c=11
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