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0.5(n+3)=9
We move all terms to the left:
0.5(n+3)-(9)=0
We multiply parentheses
0.5n+1.5-9=0
We add all the numbers together, and all the variables
0.5n-7.5=0
We move all terms containing n to the left, all other terms to the right
0.5n=7.5
n=7.5/0.5
n=15
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