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4c+9c+5=18
We simplify the equation to the form, which is simple to understand
4c+9c+5=18
We move all terms containing c to the left and all other terms to the right.
+4c+9c=+18-5
We simplify left and right side of the equation.
+13c=+13
We divide both sides of the equation by 13 to get c.
c=1
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