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2800=3.5x
We move all terms to the left:
2800-(3.5x)=0
We add all the numbers together, and all the variables
-(+3.5x)+2800=0
We get rid of parentheses
-3.5x+2800=0
We move all terms containing x to the left, all other terms to the right
-3.5x=-2800
x=-2800/-3.5
x=+800
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