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21=5.2+6c
We simplify the equation to the form, which is simple to understand
21=5.2+6c
We move all terms containing c to the left and all other terms to the right.
-6c=+5.2-21
We simplify left and right side of the equation.
-6c=-15.8
We divide both sides of the equation by -06 to get c.
c=2.6333333333333
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