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n+3+3n=-13
We simplify the equation to the form, which is simple to understand
n+3+3n=-13
We move all terms containing n to the left and all other terms to the right.
+1n+3n=-13-3
We simplify left and right side of the equation.
+4n=-16
We divide both sides of the equation by 4 to get n.
n=-4
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