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8.2n+1.6-2.8n+0.8=-8.4
We move all terms to the left:
8.2n+1.6-2.8n+0.8-(-8.4)=0
We add all the numbers together, and all the variables
5.4n+10.8=0
We move all terms containing n to the left, all other terms to the right
5.4n=-10.8
n=-10.8/5.4
n=-2
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