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0.90n=n+20
We move all terms to the left:
0.90n-(n+20)=0
We get rid of parentheses
0.90n-n-20=0
We add all the numbers together, and all the variables
-0.1n-20=0
We move all terms containing n to the left, all other terms to the right
-0.1n=20
n=20/-0.1
n=-200
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