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-5(5+3n)=20
We move all terms to the left:
-5(5+3n)-(20)=0
We add all the numbers together, and all the variables
-5(3n+5)-20=0
We multiply parentheses
-15n-25-20=0
We add all the numbers together, and all the variables
-15n-45=0
We move all terms containing n to the left, all other terms to the right
-15n=45
n=45/-15
n=-3
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