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6-3n=-8n+8n-9
We move all terms to the left:
6-3n-(-8n+8n-9)=0
We add all the numbers together, and all the variables
-3n+6-(-9)=0
We add all the numbers together, and all the variables
-3n+15=0
We move all terms containing n to the left, all other terms to the right
-3n=-15
n=-15/-3
n=+5
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