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-5n+1=3n-7n-9
We move all terms to the left:
-5n+1-(3n-7n-9)=0
We add all the numbers together, and all the variables
-5n-(-4n-9)+1=0
We get rid of parentheses
-5n+4n+9+1=0
We add all the numbers together, and all the variables
-1n+10=0
We move all terms containing n to the left, all other terms to the right
-n=-10
n=-10/-1
n=+10
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