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700+80+n+780+n=780+n
We move all terms to the left:
700+80+n+780+n-(780+n)=0
We add all the numbers together, and all the variables
n+n-(n+780)+700+80+780=0
We add all the numbers together, and all the variables
2n-(n+780)+1560=0
We get rid of parentheses
2n-n-780+1560=0
We add all the numbers together, and all the variables
n+780=0
We move all terms containing n to the left, all other terms to the right
n=-780
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