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700=5n-300
We move all terms to the left:
700-(5n-300)=0
We get rid of parentheses
-5n+300+700=0
We add all the numbers together, and all the variables
-5n+1000=0
We move all terms containing n to the left, all other terms to the right
-5n=-1000
n=-1000/-5
n=+200
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