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-0.2(12n+28)=25
We move all terms to the left:
-0.2(12n+28)-(25)=0
We multiply parentheses
-2.4n-5.6-25=0
We add all the numbers together, and all the variables
-2.4n-30.6=0
We move all terms containing n to the left, all other terms to the right
-2.4n=30.6
n=30.6/-2.4
n=-12+1/1.3333333333333
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