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-15n=-780+5n
We move all terms to the left:
-15n-(-780+5n)=0
We add all the numbers together, and all the variables
-15n-(5n-780)=0
We get rid of parentheses
-15n-5n+780=0
We add all the numbers together, and all the variables
-20n+780=0
We move all terms containing n to the left, all other terms to the right
-20n=-780
n=-780/-20
n=+39
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