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15=3+7+c
We simplify the equation to the form, which is simple to understand
15=3+7+c
We move all terms containing c to the left and all other terms to the right.
-1c=+3+7-15
We simplify left and right side of the equation.
-1c=-5
We divide both sides of the equation by -01 to get c.
c=5
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