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21=140+4c
We simplify the equation to the form, which is simple to understand
21=140+4c
We move all terms containing c to the left and all other terms to the right.
-4c=+140-21
We simplify left and right side of the equation.
-4c=+119
We divide both sides of the equation by -04 to get c.
c=-29.75
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