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21=c+5/2
We simplify the equation to the form, which is simple to understand
21=c+5/2
We move all terms containing c to the left and all other terms to the right.
-1c=+2.5-21
We simplify left and right side of the equation.
-1c=-18.5
We divide both sides of the equation by -01 to get c.
c=18.5
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