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2c+1+6c=81
We simplify the equation to the form, which is simple to understand
2c+1+6c=81
We move all terms containing c to the left and all other terms to the right.
+2c+6c=+81-1
We simplify left and right side of the equation.
+8c=+80
We divide both sides of the equation by 8 to get c.
c=10
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