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2.5(n+4)=2.5n+0.5n=
We move all terms to the left:
2.5(n+4)-(2.5n+0.5n)=0
We add all the numbers together, and all the variables
2.5(n+4)-(+3n)=0
We multiply parentheses
2.5n-(+3n)+10=0
We get rid of parentheses
2.5n-3n+10=0
We add all the numbers together, and all the variables
-0.5n+10=0
We move all terms containing n to the left, all other terms to the right
-0.5n=-10
n=-10/-0.5
n=+20
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