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6c-13-4c=-4
We simplify the equation to the form, which is simple to understand
6c-13-4c=-4
We move all terms containing c to the left and all other terms to the right.
+6c-4c=-4+13
We simplify left and right side of the equation.
+2c=+9
We divide both sides of the equation by 2 to get c.
c=4.5
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