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20=-30-5n
We move all terms to the left:
20-(-30-5n)=0
We add all the numbers together, and all the variables
-(-5n-30)+20=0
We get rid of parentheses
5n+30+20=0
We add all the numbers together, and all the variables
5n+50=0
We move all terms containing n to the left, all other terms to the right
5n=-50
n=-50/5
n=-10
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