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-18=-n-8n
We simplify the equation to the form, which is simple to understand
-18=-n-8n
We move all terms containing n to the left and all other terms to the right.
+1n+8n=+18
We simplify left and right side of the equation.
+9n=+18
We divide both sides of the equation by 9 to get n.
n=2
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