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12.5-2n+12=35-4n-9
We move all terms to the left:
12.5-2n+12-(35-4n-9)=0
We add all the numbers together, and all the variables
-2n-(-4n+26)+12.5+12=0
We add all the numbers together, and all the variables
-2n-(-4n+26)+24.5=0
We get rid of parentheses
-2n+4n-26+24.5=0
We add all the numbers together, and all the variables
2n-1.5=0
We move all terms containing n to the left, all other terms to the right
2n=1.5
n=1.5/2
n=1/1.3333333333333
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