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3n-19n+-11n+5n-7n=-18
We move all terms to the left:
3n-19n+-11n+5n-7n-(-18)=0
We add all the numbers together, and all the variables
-29n+18=0
We move all terms containing n to the left, all other terms to the right
-29n=-18
n=-18/-29
n=18/29
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