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18=5+c/2
We simplify the equation to the form, which is simple to understand
18=5+c/2
We move all terms containing c to the left and all other terms to the right.
-0.5c=+5-18
We simplify left and right side of the equation.
-0.5c=-13
We divide both sides of the equation by -00.5 to get c.
c=26
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