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1.5n+0.5n+1.5=50
We move all terms to the left:
1.5n+0.5n+1.5-(50)=0
We add all the numbers together, and all the variables
2n-48.5=0
We move all terms containing n to the left, all other terms to the right
2n=48.5
n=48.5/2
n=24+0.5/2
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