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0.5(20n+2)+2(2.5+n)=12
We move all terms to the left:
0.5(20n+2)+2(2.5+n)-(12)=0
We add all the numbers together, and all the variables
0.5(20n+2)+2(n+2.5)-12=0
We multiply parentheses
10n+2n+1+5-12=0
We add all the numbers together, and all the variables
12n-6=0
We move all terms containing n to the left, all other terms to the right
12n=6
n=6/12
n=1/2
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