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13=3+n+6
We simplify the equation to the form, which is simple to understand
13=3+n+6
We move all terms containing n to the left and all other terms to the right.
-1n=+3+6-13
We simplify left and right side of the equation.
-1n=-4
We divide both sides of the equation by -01 to get n.
n=4
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