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5280=800x+2080
We move all terms to the left:
5280-(800x+2080)=0
We get rid of parentheses
-800x-2080+5280=0
We add all the numbers together, and all the variables
-800x+3200=0
We move all terms containing x to the left, all other terms to the right
-800x=-3200
x=-3200/-800
x=+4
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