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9c+2c+c-9c=15
We simplify the equation to the form, which is simple to understand
9c+2c+c-9c=15
We move all terms containing c to the left and all other terms to the right.
+9c+2c+1c-9c=+15
We simplify left and right side of the equation.
+3c=+15
We divide both sides of the equation by 3 to get c.
c=5
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