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15c+3-12=13c+3
We simplify the equation to the form, which is simple to understand
15c+3-12=13c+3
We move all terms containing c to the left and all other terms to the right.
+15c-13c=+3-3+12
We simplify left and right side of the equation.
+2c=+12
We divide both sides of the equation by 2 to get c.
c=6
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