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-11n+18=-9n-8
We move all terms to the left:
-11n+18-(-9n-8)=0
We get rid of parentheses
-11n+9n+8+18=0
We add all the numbers together, and all the variables
-2n+26=0
We move all terms containing n to the left, all other terms to the right
-2n=-26
n=-26/-2
n=+13
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