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8n-(-5n)-(-6n)=19
We move all terms to the left:
8n-(-5n)-(-6n)-(19)=0
We get rid of parentheses
8n+5n+6n-19=0
We add all the numbers together, and all the variables
19n-19=0
We move all terms containing n to the left, all other terms to the right
19n=19
n=19/19
n=1
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