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0.2n+0.9=1.3
We move all terms to the left:
0.2n+0.9-(1.3)=0
We add all the numbers together, and all the variables
0.2n-0.4=0
We move all terms containing n to the left, all other terms to the right
0.2n=0.4
n=0.4/0.2
n=2
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