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9=4+0.2n
We move all terms to the left:
9-(4+0.2n)=0
We add all the numbers together, and all the variables
-(0.2n+4)+9=0
We get rid of parentheses
-0.2n-4+9=0
We add all the numbers together, and all the variables
-0.2n+5=0
We move all terms containing n to the left, all other terms to the right
-0.2n=-5
n=-5/-0.2
n=+25
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