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7.85-2.1c=20.75
We simplify the equation to the form, which is simple to understand
7.85-2.1c=20.75
We move all terms containing c to the left and all other terms to the right.
-2.1c=+20.75-7.85
We simplify left and right side of the equation.
-2.1c=+12.9
We divide both sides of the equation by -2.1 to get c.
c=-6.14285714286
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