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13=2c+3-5c
We simplify the equation to the form, which is simple to understand
13=2c+3-5c
We move all terms containing c to the left and all other terms to the right.
-2c+5c=+3-13
We simplify left and right side of the equation.
+3c=-10
We divide both sides of the equation by 3 to get c.
c=-3.3333333333333
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