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180=4n+40
We move all terms to the left:
180-(4n+40)=0
We get rid of parentheses
-4n-40+180=0
We add all the numbers together, and all the variables
-4n+140=0
We move all terms containing n to the left, all other terms to the right
-4n=-140
n=-140/-4
n=+35
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