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4+9c+3c=58
We simplify the equation to the form, which is simple to understand
4+9c+3c=58
We move all terms containing c to the left and all other terms to the right.
+9c+3c=+58-4
We simplify left and right side of the equation.
+12c=+54
We divide both sides of the equation by 12 to get c.
c=4.5
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